vouch
v[Ipr]
1 ~ for sb/sth take responsibility for or express confidence in (a person, his behaviour, etc); guarantee 為(某人、 其行為等)擔保或作證; 保證
I can vouch for him/his honesty. 我可以為他[他的誠實]作擔保.
2 ~ for sth confirm (a claim, etc) by producing evidence or drawing on one's own experience(提供證據或現身說法)確定(某權利要求等)
Experts vouch for the painting's authenticity. 由專家確認該畫是否為真跡.