Jump overcalls are made by skipping one level of bidding, e.g. 1♦ – (2♠).
In the past, such bids described either "strong" overcalls (e.g. with 17 points or more) or "intermediate" ones (11-15 points with a 6-card suit). Today, a far more common treatment is to use a weak jump overcall (WJO) to show the same hand shape and values as would an opening preempt at the same level.
Read more about this topic: Overcall
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