join in

to participate in an activity with other people.

• Let me join in the game.
• We joined in on the chorus.
• Please feel free to join in.
• They all joined in the chorus.
• Why don't you join in the conversation?
• They joined in the temperance movement.
• Tom began to sing and we all joined in.
• He was not able to join in the discussion.
• Each of the boys was eager to join in the race.
• Please join me in welcoming Dr Smith to our team.
• She watches the other kids playing, but she never joins in.
• She protested weakly, but ended up joining in with everyone else.