| substantiate(verb, support, back, sign, endorse) |
| suffer(verb, support, release, pass, favor) |
| sustain(verb, support, praise, favor, back) |
| swear to |
| take on(verb, expression, phrasal verb, agree, sign) |
| throw in the towel(verb, expression, idiom, accept, agree) |
| tolerate(verb, support, release, pass, favor) |
| underpin(verb, support, back, sign, uphold) |
| undersign |
| undertake(verb, agree, sign, acknowledge, assume) |
| uphold(verb, support, favor, back, sign) |
| verify(endorse, prove, substantiate, validate, corroborate) |
| vouch(verb, support, back, sign, uphold) |
| vouch for(verb, expression, phrasal verb, support, praise) |
| vouchsafe |
| yes(verb, set, settle, agree, allow) |
| yield(verb, accept, agree, allow, acquiesce) |
| abet(verb, allow, approve, authorize, sanction) |
| acquiesce to(verb, expression, allow, approve, authorize) |
| advocate(verb, support, praise, favor, back) |