join in

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

加入, 參與

participate or become involved in an activity with others

:
Everyone was singing, so I decided to join in.
大家都在唱歌,所以我決定加入
Don't be shy, just join in the game!
別害羞,直接加入遊戲吧!