O.E. bidan "to stay, continue, live, remain," also "to trust, rely" (cognate of O.N. biða, O.Fris. bidia, Goth. beidan "to wait"), apparently from PIE *bheidh-, an extended stem of one root of O.E. biddan (see bid
), the original sense of which was "to command," and "to trust"
(cf. Gk. peithein "to persuade," pistis "faith;" L. fidere "to trust," foedus "compact, treaty," O.C.S. beda "need"). Perhaps the sense evolved in prehistoric times through "endure," and "endure a wait," to "to wait." Preserved in Scotland and northern England, replaced elsewhere by abide in all senses except to bide one's time.
O.E. bodian "proclaim, announce; foretell," from boda "messenger," probably from P.Gmc. *budon- (cf. O.S. gibod, Ger. gebot, O.N. boð), from PIE *bheudh- "be aware, make aware" (cf. bid
). As a shortened form of forebode (usually evil), it dates from 1740.