1 PHRASAL VERB 为…担保(或保证) If you say that you can or will vouch for someone, you mean that you can guarantee their good behaviour. 为…担保(或保证)
2 PHRASAL VERB 证明;证实 If you say that you can vouch for something, you mean that you have evidence from your own personal experience that it is true or correct. 证明;证实