Jabber away- Talk fast or incomprehensibly
Jack around- Make trouble for someone, fail to keep promisesJack in- Quit, give upJack 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
Jerk around- Cause someone trouble, treat someone badlyJerk off
- Behave stupidly- Waste time doing unimportant things
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 eagerlyJump in- Enter a conversationJump off- Start quickly, often wellJump on- Criticize, attack
