Idiomy

burst your bubble

to say or do something that shows someone that their beliefs are false, or that what they want to happen will not happen (I'm sorry to burst your bubble, but... we weren't)

by the skin of your teeth

If you do something by the skin of your teeth, you only just succeed in doing it (He escaped from the secret police by the skin of his teeth)

hit the roof

to become extremely angry (Dad will hit the roof when he finds out I dented the car)

cut the cord

cease to rely on someone or something protective or supportive and begin to act independently (She cut the cord, now I gots to get a job!)

on the ball

to be quick to understand and react to things (I din’t sleep well last night and I’m not really on the ball today); indicating competence, alertness or intelligence (a women like that, with so much on the ball)

at the drop of a hat

If you do something at the drop of a hat, you do it immediately without stopping to think about it (People will file lawsuits at the drop of a hat these days)

bigger fish to fry

to have something more important to do (Don’t take it personally, but I have bigger fish to fry)

hit the nail on the head

to be exactly right about something (I think David hit the nail on the head when he said that kids won’t want to buy this product)