| affirm(verb, support, maintain, secure, back) |
| endorse(verb, support, take, check, maintain) |
| accept |
| approve(verb, support, take, favor, agree) |
| assure(verb, support, maintain, secure, back) |
| certify(verb, support, maintain, secure, back) |
| confirm(verb, support, maintain, secure, back) |
| countersign(verb, sign, rubber-stamp, undersign) |
| support(noun, verb, take, maintain, secure) |
| underwrite(verb, support, take, agree, sign) |
| warrant(verb, support, maintain, secure, back) |
| answer for(verb, expression, phrasal verb, support, maintain) |
| authenticate(verb, sign) |
| back(verb, adverb, support, take, maintain) |
| co-sign |
| get behind(verb, expression, phrasal verb, support, take) |
| guarantee(verb, support, maintain, back, declare) |
| notarize(verb, sign, underwrite, subscribe, authenticate) |
| prove(verb, support, maintain, secure, back) |
| sanction(verb, support, take, favor, agree) |