ruinyoudaoicibaDictYouDict[ruin 词源字典]
ruin: [14] If something is ruined, etymologically it has simply ‘fallen down’. The word’s ultimate ancestor is Latin ruere ‘fall, crumble’ (source also of English congruent). From it was derived the noun ruīna ‘fall’, which passed into English via Old French ruine.
=> congruent[ruin etymology, ruin origin, 英语词源]
ruin (n.)youdaoicibaDictYouDict
late 14c., "act of giving way and falling down," from Old French ruine "a collapse" (14c.), and directly from Latin ruina "a collapse, a rushing down, a tumbling down" (source also of Spanish ruina, Italian rovina), related to ruere "to rush, fall violently, collapse," from PIE *reue- (2) "to smash, knock down, tear out, dig up" (see rough (adj.)). Meaning "complete destruction of anything" is from 1670s. Ruins "remains of a decayed building or town" is from mid-15c.; the same sense was in the Latin plural noun.
ruin (v.)youdaoicibaDictYouDict
1580s (transitive), from ruin (n.). Intransitive sense "fall into ruin" is from c. 1600. Financial sense is attested from 1660. Related: Ruined; ruining.