Join in (sth)

Definition of this English phrasal verb

: to become involved in an activity with other people.
  (Tomar parte o participar en alguna actividad que se está llevando a cabo)

Examples of this phrasal verb

We are playing a game. Why don’t you join in?

I’ll sing the verses and I’d like you all to join in the chorus.

It’s a fool’s errand trying to get Lena to join in anything.

She made a few half-hearted attempts to join in their conversation.

Why don’t you join in?

Join in when you feel confident.