Words related to quaver
Middle English quaken, from Old English cwacian "quake (of the earth), tremble, shudder (of persons, from cold, emotion, fear, fever, etc.), chatter (of teeth)," related to cweccan "to shake, swing, move, vibrate," words of unknown origin with no certain cognates outside English. Perhaps somehow imitative (compare quag, quaver, quiver (v.), Middle English quaven "tremble, shake, palpitate," c. 1200). Related: Quaked; quaking. In Middle English formerly also with strong past-participle form quoke. The North American quaking aspen is so called by 1822.
"to tremble, shake tremulously, shudder," late 15c., perhaps imitative, or possibly an alteration of quaveren (see quaver), or from quiver (adj.) "active, agile, lively, brisk" (mid-13c.), from Old English cwifer- (in cwiferlice "zealously"), which is perhaps related to cwic "alive" (see quick (adj.)). Compare Middle Dutch kuyveren "to tremble." Related: Quivered; quivering. As a noun, "act or state of quivering," by 1715, from the verb.