If you vouch for someone, you provide evidence or guarantee something on their behalf. If you vouch for your brother, you're saying he's a stand-up type of guy.

First used in the 14th century, vouch comes from the Latin vocitare, ("to call, call upon, or summon"). Sometimes it can mean offering supporting evidence, as when, for example, you're summoned to court to testify on someone's behalf. If you write a letter of recommendation for a student or co-worker, you vouch for their character and abilities. If you take out a student loan, the government will automatically vouch for you, that is, they'll guarantee the loan will be repaid.

Definitions of vouch

v give personal assurance; guarantee

“Will he vouch for me?”
Type of:
attest, bear witness, take the stand, testify
give testimony in a court of law

v give surety or assume responsibility

“I vouch for the quality of my products”
assure, ensure, guarantee, insure, secure
make certain of
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secure the release of (someone) by providing security
give a guarantee or promise of
assure payment of
guarantee payment on; of checks
Type of:
pledge, plight
promise solemnly and formally

v give supporting evidence

“He vouched his words by his deeds”
Type of:
affirm, confirm, corroborate, substantiate, support, sustain
establish or strengthen as with new evidence or facts

v summon (a vouchee) into court to warrant or defend a title

Type of:
cite, summon, summons
call in an official matter, such as to attend court

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