Meaning of “join in (something)” in the English Dictionary

american-english dictionary

"join in (something)" in American English

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join in (something)

phrasal verb with join us /dʒɔɪn/ verb [ I/T ]

to become involved with others in doing something:

Everyone can join in when I sing the National Anthem.

(Definition of “join in (something)” from the Cambridge Academic Content Dictionary © Cambridge University Press)