| underline(verb, strengthen, buttress) |
| vouch(verb, support, back, sign, uphold) |
| warrant(verb, support, back, sign, uphold) |
| witness(verb, support, back, sign, uphold) |
| abide |
| affirm(verb, support, back, sign, uphold) |
| approve(verb, support, back, sign, prove) |
| base(verb, rest, provide, over) |
| bless(verb, support, back, sign, uphold) |
| brook |
| bulwark(hold, reinforce) |
| buy(verb, support, back, sign, uphold) |
| certify(prove, verify, substantiate, validate, corroborate) |
| check(verb, support, back, uphold, explain) |
| check out(expression, prove, verify, substantiate, validate) |
| continue(verb, stay, extend, sustain, last) |
| cradle |
| cushion |
| double-check(verb, support, back, uphold, explain) |
| emphasize(verb, strengthen, buttress) |