gnarl (v.)youdaoicibaDictYouDict[gnarl 词源字典]
"contort, twist, make knotty," 1814, a back-formation from gnarled (q.v.). As a noun from 1824, "a knotty growth on wood." Earlier an identical verb was used imitatively in a sense of "to snarl" like a dog (1590s); Farmer & Henley lists gnarler as thieves' slang for "a watch-dog."[gnarl etymology, gnarl origin, 英语词源]
gush (v.)youdaoicibaDictYouDict
c. 1400, "to rush out suddenly and forcefully" (of blood, water, etc.), probably formed imitatively in English or from Low German, or from or based on Old Norse gusa "to gush, spurt," from PIE *gus-, from PIE *gheus- "to pour," and related to geyser. Metaphoric sense of "speak in an effusive manner" first recorded 1873. Related: Gushed; gushing. The noun is 1680s, from the verb.