Meaning of “fall in with sth” in the English Dictionary

british dictionary

"fall in with sth" in British English

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fall in with sth

informal
phrasal verb with fall uk /fɔːl/ us /fɑːl/ verb fell, fallen

to accept and support a plan or suggestion:

It seemed like a good idea so we just fell in with it.

(Definition of “fall in with sth” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)