vouch

保證、斷言正式

I can vouch that every figure in this report is accurate.

我可以保證這份報告裡的每個數字都準確無誤。

證明、證實正式

These old letters vouch the authenticity of the painting.

這些舊信件證明了這幅畫的真偽。

替…擔保、為…作保

She vouched for him when he applied for the job.

他應徵那份工作時，她替他擔保。

保證、掛保證口語

I can vouch for the quality of the coffee at that little shop.

那家小店的咖啡品質我可以掛保證。