join in

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join in

To start participating in something; to join. Come on, Davey, join in the fun. Just because the other kids were making fun of him doesn't mean you should have joined in.
See also: join

join in (with something)

to participate in doing something. The older boys joined in with the singing. I'm glad they joined in. We needed basses.
See also: join

join in

v.
To take part in something; participate in something: The tenors started singing, and then the sopranos joined in. The adults joined in the celebration.
See also: join