In imperative = ‘be assured’, ‘you may be certain’, and later in monitory formulæ and polite phrases (e.g. ye shall wit, please it you to wit) = ‘you…

transitive. To promise, vow; to pledge. Later also: to give promise of; to prophesy, portend. Frequently with double object. Also intransitive: to…

intransitive. Scottish. to stand for it: to warrant or vouch for something. Also with that-clause as complement. Chiefly in I stand for it (and…

to take a person's word: (a) to trust a person's promise, esp. a promise to repay a debt for which credit has been given (obsolete); (b) to accept…

intransitive. I protest: used as an asseveration. Cf. declare, v. 6b. Now rare.

I warrant me (originally quasi-archaic) = ‘I warrant’, ‘I'll be bound’.