gang up

gang up on

To join together in a group in order to overpower someone else.

connect up

To join together, to connect.

become one flesh

To join together in marriage; to develop a unifying bond as a result o…

join forces

To combine labour, to come together, to unite.

join hands

To work together to achieve a common goal.

sit in with

To join (often as an observer, supervisor or outsider) a group working…