O.E. brecan (class IV strong verb; past tense bręc, pp. brocen), from P.Gmc. *brekan (cf. O.Fris. breka, Du. breken, O.H.G. brehhan, Ger. brechen, Goth. brikan), from PIE base *bhreg- "to break" (see fraction). Most modern senses were in O.E. Meaning "to disclose" is from 1450. Noun sense of "short interval between spells of work (originally between lessons at school) is from 1861. Break the ice is 1602, in ref. to the "coldness" of encounters of strangers. Break wind first attested 1552. Ironic theatrical good luck formula break a leg has parallels in Ger. Hals und Bein brechen "break your neck and leg," and It. in bocca al lupo.