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Chicken out
Chicken feed

Butter wouldn't melt (in sb's mouth)
Put on airs
Play dumb
Mutton dressed as lamb
All bark and no bite
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Fly off the handle
Bark up the wrong tree
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Brainchild
Pick one's brain
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Keep one's shirt on
Lose one's shirt

Keep an ear to the ground
Up to one's ears
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Job security
Job satisfaction
Be entitled to

It goes in one ear and out the other
Play by ear