| opt in(expression, play, participate, cooperate) |
| partake in(verb, expression, participate) |
| partner(play, participate, cooperate) |
| play a part(expression, idiom, play, join, contribute) |
| play a part in |
| play a role in |
| play ball(expression, play, participate, cooperate) |
| pool resources(expression, play, participate, cooperate) |
| present oneself(expression, play, participate, cooperate) |
| pull together(expression, play, participate, cooperate) |
| second(play, participate, cooperate) |
| share in(expression, play, participate, cooperate) |
| show willingness(expression, play, participate, cooperate) |
| side with(expression, play, participate, cooperate) |
| stick together(expression, play, participate, cooperate) |
| succor(play, participate, cooperate) |
| take part(expression, play, join, contribute, cooperate) |
| tuned in(expression, play, aid, perform) |
| undertake(verb, engage, attempt) |
| unite(play, participate, cooperate) |