Word Origin & History
freak
1563, "sudden turn of mind," probably related to O.E. frician "to dance" (not recorded in M.E., but the word may have survived in dialect), or perhaps from M.E. frek "bold, quickly," from O.E. frec "greedy, gluttonous." Sense of "capricious notion" (1563) and "unusual thing, fancy" (1784) preceded that in freak of nature (1847). The verb freak out is first attested 1965 in Amer.Eng., from freak (n.) "drug user" (1945), but the verb meaning "change, distort" goes back to 1911, and the sense in health freak, ecology freak, etc. is attested from 1908.