英语词源字典 - 在线词源网站

faint (v.)[faint 词源字典]: c. 1300, "grow weak, become enfeebled," also "lack courage or spirit, be faint-hearted," and "to pretend, feign;" from faint (adj.). Sense of "swoon, lose consciousness" is from c. 1400. Also used in Middle English of the fading of colors, flowers, etc. Related: Fainted; fainting. For Chaucer and Shakespeare, also a transitive verb ("It faints me").[faint etymology, faint origin, 英语词源]
sal volatile (n.): 1650s, Modern Latin, literally "volatile salt" (see salt (n.) + volatile); ammonium carbonate, especially as used in reviving persons who have fainted.