"regard with deep respect and veneration," 1660s, from French révérer, from Latin revereri "revere, fear," from re-, here perhaps an intensive prefix (see re-), + vereri "stand in awe of, fear, respect" (from PIE root *wer- (3) "perceive, watch out for"). Reverence was the earlier form of the verb. Related: Revered; revering.
c. 1300, "shake from fear, cold, etc.," from Old French trembler "tremble, fear" (11c.), from Vulgar Latin *tremulare (source also of Italian tremolare, Spanish temblar), from Latin tremulus "trembling, shaking, quaking," from tremere "to tremble, shiver, quake," from PIE *trem- "to tremble" (source also of Greek tremein "to shiver, tremble, to quake, to fear," Lithuanian tremiu, tremti "to chase away," Old Church Slavonic treso "to shake," Gothic þramstei "grasshopper"). A native word for this was Old English bifian. Related: Trembled; trembling. The noun is recorded from c. 1600.
late 12c., "to fear very much, be in shrinking apprehension or expectation of," a shortening of Old English adrædan, contraction of ondrædan "counsel or advise against," also "to dread, fear, be afraid," from ond-, and- "against" (the same first element in answer, from PIE root *ant-) + rædan "to advise" (from PIE root *re- "to reason, count"). Cognate of Old Saxon andradon, Old High German intraten. Related: Dreaded; dreading.
As a noun from c. 1200, "great fear or apprehension; cause or object of apprehension." As a past-participle adjective (from the former strong past participle), "dreaded, frightful," c.1400; later "held in awe" (early 15c.).