From Longman Dictionary of Contemporary Englishget in with somebody phrasal verb informalRELATIONSHIPto become friendly with someone He got in with a bad crowd and started getting into trouble. → get→ See Verb table
Examples from the Corpus
get in with • He reckoned he'd a right to nice things the same as this bad company he'd got in with.• He'd got in with the punks and seen immediately what they were doing, what a renaissance this was in music.• Since they had got in with this crowd, she had not felt very happy. 