Yours, Etc.: Origins and Uses of 8 Sign-Offs
1580s, "to transgress," a back formation from prevarication, or else from Latin praevaricatus, past participle of praevaricari "to make a sham accusation, deviate," literally "walk crookedly;" in Church Latin, "to transgress" (see prevarication). Meaning "to speak evasively" is from 1630s. Related: Prevaricated; prevaricating.