join in

US /dʒɔɪn ɪn/
UK /dʒɔɪn ɪn/
"join in" picture
1.

mitmachen, teilnehmen

participate or become involved in an activity with others

:
Everyone was singing, so I decided to join in.
Alle sangen, also beschloss ich, mitzumachen.
Don't be shy, just join in the game!
Sei nicht schüchtern, mach einfach mit beim Spiel!