join in
US /dʒɔɪn ɪn/
UK /dʒɔɪn ɪn/

1.
participar, juntar-se
participate or become involved in an activity with others
:
•
Everyone was singing, so I decided to join in.
Todos estavam cantando, então decidi participar.
•
Don't be shy, just join in the game!
Não seja tímido, apenas participe do jogo!