Definitions
1.VerbTo call on (someone) to be a witness to something.
To cite or rely on (an authority, a written work, etc.) in support of one's actions or opinions.
2.VerbTo call on (someone) to be a witness to something.
3.VerbTo cite or rely on (an authority, a written work, etc.) in support of one's actions or opinions.
4.VerbTo affirm or warrant the correctness or truth of (something); also, to affirm or warrant (the truth of an assertion or statement).
5.VerbTo bear witness or testify to the nature or qualities (of someone or something).
6.VerbTo back, confirm, or support (someone or something) with credible evidence or proof.
7.VerbSynonym of vouchsafe (“to condescendingly or graciously give or grant (something)”).
8.VerbTo assert, aver, or declare (something).
9.VerbIn full vouch to warrant or vouch to warranty: to summon (someone) into court to establish a warranty of title to land.
Followed by over: of a vouchee (a person summoned to court to establish a warranty of title): to summon (someone) to court in their place.
To guarantee legal title (to something).
10.VerbIn full vouch to warrant or vouch to warranty: to summon (someone) into court to establish a warranty of title to land.
11.VerbFollowed by over: of a vouchee (a person summoned to court to establish a warranty of title): to summon (someone) to court in their place.
12.VerbTo guarantee legal title (to something).
13.VerbOften followed by for.
To bear witness or testify; to guarantee or sponsor."I can vouch that he wasn’t at the scene of the crime."
14.VerbTo bear witness or testify; to guarantee or sponsor."I can vouch that he wasn’t at the scene of the crime."
15.VerbTo provide evidence or proof.
16.VerbTo express confidence in or take responsibility for (the correctness or truth of) something.
17.NounAn assertion, a declaration; also, a formal attestation or warrant of the correctness or truth of something.