Definition of jump in
: to say something about a subject that another person is already talking about : to join a conversation Jump in if you have any questions.
Word by Word Definitions
: to spring into the air : leap
: to spring free from the ground or other base by the muscular action of feet and legs
: to move suddenly or involuntarily : start
: an act of jumping : leap
: any of several sports competitions featuring a leap, spring, or bound
: a leap in figure skating in which the skater leaves the ice with both feet and turns in the air
: exactly, pat
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