Taking The Temperature (of a group), Buck Up
To "take the temperature" of a group is to obtain opinions from various members and determine the level of support, or opposition, in the group for a particular action or policy.
A group can be warm or cold to an action or policy.
Example: "Democratic insiders are taking the temperature of some top party donors about the possibility of naming White House press secretary Robert Gibbs as chairman of the Democratic National Committee heading into President Barack Obama’s reelection campaign in 2012, senior officials tell POLITICO."
This means, the insiders are measuring the support, or lack thereof, for placing outgoing press secretary Robert Gibbs as chairman of the Democratic National Committee. According to the article (link below), reaction is positive, so we may say members are warm to the possibility.
http://www.politico.com/news/stories/1010/43035.html#ixzz11HJk5C9c
Buck Up
To buck up is to behave like a buck - in the sense of, a male deer - that is rutting, that is, in the midst of its mating cycle. This would be similar to a cat in heat, except it applies exclusively to males and represents aggressive male behavior, such as butting heads with other bucks (figuratively and very much literally), displays of antlers to female deer, and so forth.
This expression has evolved from a meaning similar to "dressing up" (that is, dressing in a snappier/ more vibrant manner that is pleasing to women) to the sense of "raise your spirits" and to become more enthusiastic. However, there is another connotation. Let's begin with an example.
Example: In reference to disappointed Democratic Party and left-wing political activists, Vice President Joe Biden revised an earlier comment in which he told people to "stop whining" with the following statement:
"And so those who don't get -- didn't get everything they wanted, it's time to just buck up here, understand that we can make things better, continue to move forward and -- but not yield the playing field to those folks who are against everything that we stand for in terms of the initiatives we put forward," Biden said on MSNBC.
However, in this sense, "buck up" is really telling people to "man up," to behave with a strong, male spirit, to show some backbone, and indeed, to grow a spine.
Thus, it is difficult to understand his comment as an attempt to tell Democratic activists to stop whining, just as he had done before. VP Biden simply used an older expression to convey an identical message without using the same words in the belief that people would find "buck up" to be less offensive than "stop whining," even while conveying the exact same message: that left-wing activists should rise up and vote for the Democratic Party in the 2010 mid-term elections.
Thus, it is a distinction without a difference. Indeed, younger activists may not even understand what "buck up" is intended to mean. Men in their late 60's who have been involved in politics for most of their lives certainly would know the term, however. We cannot know if those in the intended audience who are familiar with the term will understand the message as being any different (that is, less patronizing) than the earlier "stop whining" statement.
P.S. Telling any American adult to stop whining is to treat that person like a child and is normally considered rude to the extreme.
➤ Read more idioms and phrases, English grammar and vocabulary at Basic English Grammar And Vocabulary .
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100 Articles on Idioms and Phrases
We Have A Situation, Picking Up Some Chinese (Food)
Origin: Phrases Derived from Various Sources, Part 1
Getting Warmer, The Suffix, -ish, Coming To A Head, Hitting the Books
What's Your Beef, Not Quite So Simple
A Lame Duck, lame duck session
Pain At The Pump, Slogging One's Way, Being Outdoors
A Number Of Something, A Product Line, To Kill A Product Line
A Big Freeze,To Be In, Or Not In, Arm-Twisting
Last-Minute, Propelled By, Squeaking By
Blowing A Gasket, Lost In Translation
Nothing To Lose, It Can't Hurt, A Babe In The Woods
Neck Of The Woods, Turning The Other Cheek, A Loudmouth
An Odyssey, Getting One's Feet Wet
Significant Other, Having Something To Say
Through and Through, A Crying Shame
Tell Us How You Really Feel, Barking Up The Wrong Tree
Begging On Hands And Knees, The Front Burner & The Back Burner
Wilderness and Errand Themed Idioms, In The Wilderness
Surging and Ebbing, Playing Your Cards Right
Positive and Negative Advertisements, Enthusiasm Gap
Through The Barrel Of A Gun, Man Up,
A Case For Action, Darkening, Brightening, Salvaging Victory
Political Battlegrounds, Pumping Money, A Wave Of Ads, Ramping Up Spending
English Proverbs With Their Meanings
Smooth Sailing, Rough Sailing, Sailing To Victory, Going Solar, Zombie Banks
Taking The Temperature (of a group), Buck Up
Show Some Backbone, Have / Grow A Spine, Breathing Down Someone's Neck, Front Runner Status
Staring Down The Barrel Of...., In Line (To Succeed), Up For Grabs, Band-Aid Solution
A Blip, A Wave, A Tsunami/ A Tidal Wave, A Method To One's Madness, Crowning Achievement
Easier Said Than Done, In Store, Jumping The Shark, Heading Downhill
In All Seriousness, Digging It, Giving A Damn, A.M. and P.M., Keep Up The Good Work
To Keep Something Coming, Make My Day, Forcing Something, Turning The Page
Mission Accomplished, I Can't Thank You Enough, Words Fail Me, At A Loss For Words
"I Can't Hear You!", To Snatch Away, At The Top Of Your Lungs, Hanging Your Head (In Shame)
https://idiomscollect.blogspot.com/2017/04/i-cant-hear-you-to-snatch-away-at-top.html
Leaving It All On The Field, Cool, Hot, To Trust Blindly, I'm Free
The Day of Reckoning, Aiming For Something, Hopping Mad, You've Gotta Be Kidding Me
Throwing The Baby Out With The Bathwater, Off The Reservation, At First Blush
Smelling A Rat, A Packrat, A Frog In Your Throat
When Pigs Fly, Horsing Around, An Eager Beaver, Dropping Like Flies
Wolfing Food Down, Pigging Out, Opening A Can Of Worms
A White Elephant, The Tip of the Iceberg
Letting The Cat Out Of The Bag, A Fat Cat
Making Waves, Go With The Flow, Down to Earth
A Stick-In-The-Mud, A Sight For Sore Eyes, Raining On Someone's Parade
Under the Weather, Having Your Head In The Clouds
Stealing Someone's Thunder, Hitting the Sack, Hitting the Hay, Digging Deep, Cheesy
A Bad Apple, A Bad Egg, One's Bread and Butter, A Piece of Cake
In A Nutshell, Egg on your Face, A Hot Potato, Hitting the Sauce, Gravy Train etc.
Riding Someone's Coattails, Caught On Tape, Armed to the Teeth, Seeing Eye To Eye
Flipped On Its Head, In The Heart Of, I Feel Like A Million Bucks, On The Line
Notable English Idioms: Part 01
Notable English Idioms: Part 02
Idioms beginning with E, F, G, H
Idioms beginning with I, J, K, L
Idioms beginning with P, Q, R, S
Idioms beginning with T, U, V, W, X, Y, Z