vouch

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
  1. verb
    give personal assurance; guarantee
    “Will he vouch for me?”
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    type of:
    attest, bear witness, take the stand, testify
    give testimony in a court of law
  2. verb
    give surety or assume responsibility
    “I vouch for the quality of my products”
    synonyms: guarantee
    assure, ensure, guarantee, insure, secure
    make certain of
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    types:
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    bail
    secure the release of (someone) by providing security
    stipulate
    give a guarantee or promise of
    secure
    assure payment of
    certify
    guarantee payment on; of checks
    type of:
    pledge, plight
    promise solemnly and formally
  3. verb
    give supporting evidence
    “He vouched his words by his deeds”
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    type of:
    affirm, confirm, corroborate, substantiate, support, sustain
    establish or strengthen as with new evidence or facts
  4. verb
    summon (a vouchee) into court to warrant or defend a title
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    type of:
    cite, summon, summons
    call in an official matter, such as to attend court
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