Jack around - Make trouble for someone, fail to keep promises Jack in - Quit, give up Jack up - Raise a car to be able to do mechanical work - Increase sharply
Jam on - Apply or operate something forcefully
Jaw away - Talk just for the point of talking rather than having anything to say
Jazz up - Make something more interesting or attractive
Joke around - Be funny, or try to
Jot down - Make a quick note
Juice up - Make something more exciting or perform better
Jump at - Accept eagerly Jump in - Enter a conversation Jump on - Criticize, attack
Jump at
Jump in
Jump on - Criticize, attack
