American criminal underworld slang, 1906 (noun), 1915 (verb), alteration of graft (“corruption, illicit profit through corrupt means, bribe, one's occupation”), alteration perhaps influenced by similar sounding words, e.g. drift, etc., probably ultimately from Middle Dutch graft (“digging, ditch, canal, trench”) (modern Dutch gracht), related to Dutch graven (“to dig”), English grave (“to dig”).
Practice speaking and memorizing "grift" and many other words and sentences in English.