flock to (?.)
- act with
- align with
- get together with
- go along with
- go in with
- join
- join hands with
- join up with
- join with
- line up with
- rally round
- range with
- side with
- stand in with
- strike in with
- string along with
- swing in with
- take part with
- take sides with
- team up with
- throw in with
- unite with