| promise(noun, verb, support, give, maintain) |
| affirm(verb, support, state, hold, show) |
| testify(verb, law, support, state, give) |
| assert(verb, state, hold, show, press) |
| aver(verb, support, state, hold, show) |
| avow(verb, state, hold, press, maintain) |
| declare(verb, state, hold, show, press) |
| warrant(verb, support, state, show, press) |
| depose(verb, phrasal verb, law, state, give) |
| pledge(noun, verb, support, maintain, secure) |
| state(noun, verb, hold, press, maintain) |
| guarantee(verb, state, maintain, declare, agreement) |
| attest(verb, law, support, state, hold) |
| assure(verb, support, state, maintain, secure) |
| undertake(verb, agree, declare, approve, uphold) |
| vouch(verb, state, maintain, declare, tell) |
| vouchsafe(verb, promise) |
| confirm(verb, support, state, show, maintain) |
| covenant(noun, verb, agree, declare, agreement) |
| take an oath(verb, expression, idiom, declare, approve) |