From Longman Dictionary of Contemporary Englishjump in phrasal verbINTERRUPTto interrupt someone or suddenly join a conversation Lena quickly jumped in with a diverting remark. → jump→ See Verb table
Examples from the Corpus
jump in• a jump in real estate pricesFrom Longman Business Dictionaryjump in phrasal verb [intransitive] to do something quickly, often without thinking about it carefullyHe counseled caution to clients wanting to jump in and buy stocks. → jump→ See Verb table 