Tremble
Middle English (as a verb): from Old French trembler, from medieval Latin tremulare, from Latin tremulus (see tremulous).
wiktionary
From Middle English tremblen, from Old French trambler and its variants, from Vulgar Latin tremulō, a derivative of Classical Latin tremō; cf. also tremulus.
etymonline
tremble (v.)
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.
