Phrasal Verbs: J
Jack up
To raise (a physical object, a price, etc.) ex. "The hotels around here usually jack up their prices during the summer season."
Joke around:
To kid. To be humorous. ex. "He was just joking around, but his girlfriend didn't find it funny."
Jump all over:
To seriously scold. ex. "She jumped all over me when I got home at 3:00 AM last Tuesday."
Jump at:
To willingly seize/ accept the opportunity. ex. "George jumped at the chance to go to Australia with his best friends."