|chip on his shoulder
||in a fighting mood, looking for a fight
||Ron has a chip on his shoulder. He's arguing with everybody.
|chips are down
||(See when the chips are down)
||very full, full to the top, chockablock, plump full
||The truck was chock full of paper to be recycled.
||tightly packed, crammed in one place, chock full
||The square was chockablock with people - all looking at the pope.
||be so nervous you cannot perform or do it well
||Don't even think about choking when you make your speech.
||angry, mad, pissed
||She was really choked when you called her a bitch.
|chomping at the bit
||eager to go, anxious to leave
||If you mention camping, the kids will be chomping at the bit.
||help one side or team, take sides
||Some of the students will dislike you if you choose sides.
|choose up sides
||choose people to play on two or more teams
||Let's choose up sides and play a game of volleyball.
||lips and teeth, mouth
||You need big chops to play the tuba, eh.