Definitions from Wiktionary ( )

▸ verb:  (transitive, intransitive) To assert the truth of (something); to affirm (something) with confidence; to declare (something) in a positive manner.
▸ verb:  (transitive, intransitive, law) To justify or prove (an allegation or plea that one has made).
▸ verb:  (transitive, obsolete) To avouch, prove, or verify the existence or happening of (something), or to offer to do so.
▸ noun:  (British, dialectal, archaic) A beast of burden; chiefly a workhorse, but also a working ox or other animal.
▸ noun:  (Northern England, Scotland, dialectal, archaic) An old, useless horse; a nag.

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