threatyoudaoicibaDictYouDict[threat 词源字典]
threat: [OE] Threat originally meant ‘trouble, oppression’; ‘expression of an intention to do harm’ is a secondary sense, which arose out of the notion of ‘putting pressure’ on someone. It came from a prehistoric base *thraut-, *threut-, *thrut-, which probably went back to Indo- European *trud- ‘push, press’ (source also of Latin trūdere ‘thrust’, from which English gets abstruse, intrude, etc, and probably also of English thrust).
=> abstruse, intrude[threat etymology, threat origin, 英语词源]
threat (n.)youdaoicibaDictYouDict
Old English þreat "crowd, troop," also "oppression, coercion, menace," related to þreotan "to trouble, weary," from Proto-Germanic *thrautam (cognates: Dutch verdrieten, German verdrießen "to vex"), from PIE *treud- "to push, press squeeze" (cognates: Latin trudere "to press, thrust," Old Church Slavonic trudu "oppression," Middle Irish trott "quarrel, conflict," Middle Welsh cythrud "torture, torment, afflict"). Sense of "conditional declaration of hostile intention" was in Old English.