warrant (v.) 3
act as a pledge for, give an assurance about
AYL IV.i.43 [Rosalind as Ganymede to Orlando, of a lover breaking his promise] it may be said of him that Cupid hath clapped him o'th' shoulder, but I'll warrant him heart-whole [i.e. not broken-hearted]
CE IV.iv.3 [Antipholus of Ephesus to Officer] I'll give thee ere I leave thee so much money / To warrant thee as I am 'rested for
MA IV.i.164 [Friar to all] Trust not my reading nor my observations, / Which with experimental seal doth warrant / The tenor of my book
Tem I.i.45 [Gonzalo to all, of the Boatswain] I'll warrant him for drowning [i.e. I'm confident he won't drown]
TG II.vii.71 [Juliet to Lucetta] instances of infinite of love, / Warrant me welcome to my Proteus
Tit I.i.275 [Lavinia to Saturninus] true nobility / Warrants these words in princely courtesy
TNK III.v.76 [Third Countryman to Schoolmaster, of the Gaoler's Daughter] I warrant her, she'll do the rarest gambols
WT IV.iii.105 [Autolycus to Clown, of not fighting his supposed assailant] I am false of heart that way, and that he knew, I warrant him