Wiktionary
would'st
vb. (obsolete form of lang=en wouldst)
Usage examples of "would'st".
Thou art very vain of thy beard, thou art combing and dressing it ten times a day, and thou would'st not shave half of it to get me out of this body.
O Venus, who art goddess of pleasance, Since he did serve thee well, this Chanticleer, And to the utmost of his power here, More for delight than cocks to multiply, Why would'st thou suffer him that day to die?