1. join in
Today we are going to learn “join in”. If you join in an activity, you take part in it or become involved in it.
(1). I’ll join you in the fun after I finish my work.
(2). I like to watch a group or activity for awhile before I join in.
2. vest in
Another phrase is “vest in”. If property, shares, etc. vest in someone, they legally become theirs.
(1). The author’s copyrights became vested in his trustee when he died.
(2). I have vested all my trust in you.