Use of Unauthorized Information from Your Partner!
Law 16: ANY extraneous information from partner that MIGHT suggest a bid or play is UNAUTHORIZED. This include remarks, questions, unmistakable hesitation, tone, gesture, movement or mannerism. A player may NOT choose a bid, pass, or play that is suggested by partner's behavior.
When a player thinks an opponent has made information available in a manner noted above, he may announce that he reserves the right to call the Director later or may summon the Director immediately.
When you jump in your bidding, does your partner understand what information you are giving? Is a jump by responder the same as a jump by opener?
Larry Cohen warns: Be careful before jumping.
In bidding, jumps are dangerous if they mean something different to you and to your partner. An old classic: what does the auction 1♣ --P--2♥ mean?
The answer: it’s either a weak bid or a strong bid. Great! If you haven’t discussed this with your partner, you shouldn’t do it!
Jump bids have very specific meanings, but sometimes it’s best to not make a jump bid if there’s a chance partner could get confused.
Read Cohen's article to get a clearer picture of how best to jump!