Vouch/vaʊtʃ/ Definition 1 of 3Pro Tip 1/3Personal Assurance Used when personally endorsing someone's abilities or characteristics. Having worked with her, I can vouch for her expertise. Pro Tip 2/3Based on Experience Emphasizes the speaker's experience, solidifying the reliability of the endorsement. Since I've eaten there often, I vouch for their superb cuisine. Pro Tip 3/3Not Absolute Certainty While strong, it's not a 100% guarantee; there's trust involved. I vouch for her, but it's ultimately your decision to hire her.