jiff /d͡ʒɪf/noun 1verb 1forms 3 noun1 •(informal) A jiffy; a moment; a short time.Oh, yerss. Come in. Half a jiff till I finished this bottom stair. Now then—whoa!—don't touch that banister; it's a bit loose. — 1918 verb1 •(slang) To deceive, swindle, trick formsjiffed · jiffing · jiffs