| sign on(verb, expression, phrasal verb, follow, enter) |
| sign up(verb, expression, phrasal verb, follow, enter) |
| slap on(verb, expression, phrasal verb, develop, secure) |
| socialize(verb, join, party, mix, associate) |
| solidify(verb, develop, secure, join, unite) |
| stabilize(verb, develop, secure, join, unite) |
| stand in with(verb, expression, idiom, phrasal verb, join) |
| stand together |
| strengthen(verb, develop, secure, join, unite) |
| synthesize(verb, join, unite, link, connect) |
| tack on(verb, expression, phrasal verb, develop, secure) |
| take part in(verb, expression, idiom, phrasal verb, follow) |
| team up |
| thicken(verb, develop, secure, join, unite) |
| throw in together(verb, expression, idiom, phrasal verb, develop) |
| unionize |
| unite(verb, join, combine, link, connect) |
| accumulate |
| assemblage(verb, thronging, piloted, partnered) |
| attendance(verb, assemblage, thronging, piloted, partnered) |