soothe (v.)youdaoicibaDictYouDict[soothe 词源字典]
Old English soðian "show to be true," from soð "true" (see sooth). Sense of "quiet, comfort, mollify" is first recorded 1690s, via notion of "to assuage one by asserting that what he says is true" (i.e. to be a yes-man), a sense attested from 1560s (and compare Old English gesoð "a parasite, flatterer"). Meaning "reduce the intensity" (of a pain, etc.) is from 1711. Related: Soothed; soothing.[soothe etymology, soothe origin, 英语词源]
yes (adv.)youdaoicibaDictYouDict
Old English gise, gese "so be it!," probably from gea, ge "so" (see yea) + si "be it!," third person imperative of beon "to be" (see be). Originally stronger than simple yea. Used in Shakespeare mainly as an answer to negative questions. As a noun from 1712. Yes-man is first recorded 1912, American English.