A Lame Duck, lame duck session
In politics, and sometimes business, someone in a powerful position who everyone knows will be leaving office at a particular time, but who is still in office, is called a lame duck. This is "lame" not in the sense of uncool, but in the sense of powerless due to injury.
In other words, the lame duck is unable to exert power over others because the knowledge he or she will be departing - and therefore, has less and less power to punish others for defiance with each day that passes - reduces the psychological and leadership power of that person.
Note that while being a lame duck is related to an impending departure, many people only call someone a lame duck when that person's power enters pronounced decline, a little like "jumping the shark."
Example: An American President in his second term eventually experiences an erosion in his ability to make Congress do what he wants, losing influence with even members of his own party. Due to strongly established tradition and the great difficulty of changing the constitution, the limit to two terms of four years is virtually unchangeable. Therefore, members of Congress know as a fact that the President will be departing. When the President reaches this point of limited influence, he begins to be called "a lame duck."
Also, the term "lame duck session" (relating to Congress) is a little different. This is the result of two accidents of the American system: 1) members being officially in office even after an election, until the following January (much like Presidents); 2) a modern habit of not completing budgetary business (in the trillions of dollars) within the normally scheduled time.
In 2010, legislating in the "lame duck session" between the November election and the end of 2010 reached new heights, with major pieces of legislation passed, although a giant budget bill was forced to be abandoned (and this is, I must point out, an extremely rare event). Some have questioned the propriety of legislators who have been voted out of office - and are thus "lame ducks" themselves - voting on issues of such importance, but this lack of consequences (they already lost!) has been used to great advantage by the Democratic Party in 2010.
Thus, the lame duck session is so called because departing Congressmen and Senators who are "lame ducks" are still able to use the full power of their offices... which is, again, a kind of accident of the American political system. Traditionally, they are not well regarded.
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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