tremor (n.)youdaoicibaDictYouDict[tremor 词源字典]
late 14c., "terror," from Old French tremor "fear, terror, quaking" (13c.), from Latin tremorem (nominative tremor) "a trembling, terror," from tremere (see tremble (v.)). Sense of "an involuntary shaking" first recorded 1610s and probably represents a re-introduction from Latin.[tremor etymology, tremor origin, 英语词源]