A Bad Apple, A Bad Egg, One's Bread and Butter, A Piece of Cake

A Bad Apple
A "bad apple" is someone who might not be in trouble with the law (as is the case for "a bad egg"), but is a person who has a bad attitude (often about work), who is a negative influence in a team, and who is generally not pleasant to work with or be around.
Ex.: "That guy we just hired? I think he's a bad apple. He snaps at co-workers; he's becoming a real distraction." The new employee is creating negativity around him.


A Bad Egg
Figuratively, a bad egg is someone who is often involved in trouble, such as petty crime, vandalism, and so forth.
Ex.: "I don't want you hanging around with that boy! He's a bad egg. He'll get you arrested someday!" Here, "that boy" is well known as a delinquent and is involved with shady things (though not necessarily on a serious level... yet).

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In A Nutshell, Egg on your Face, A Hot Potato, Hitting the Sauce, Gravy Train etc.

In A Nutshell
A nutshell is a small package provided by Mother Nature, containing a seed. The expression "in a nutshell" is for something that can be explained, represented, or summarized, in a small package.
Ex.: "Vegetarianism In A Nutshell" is a website devoted to explaining vegetarianism in a short, concise, and efficient manner.


Egg on your Face
To unknowingly have a piece of egg on your face is a dinnertime embarrassment. To figuratively have "egg on your face" is to be embarrassed by something unrelated to food.
Ex.: "Apple has egg on its face after its claims the iPhone 4's call signal problems are 'software based' now that Consumer Reports has established, through testing by its engineers, that the problem is indeed a hardware based design flaw."

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