join in

US /dʒɔɪn ɪn/

UK /dʒɔɪn ɪn/

1.

participate or become involved in an activity with others

:

•

Everyone was singing, so I decided to join in.

•

Don't be shy, just join in the game!

:

participate engage take part contribute get involved

:

join join up be joined in matrimony join forces