Bicker
Middle English: of unknown origin.
wiktionary
From Middle English bikeren(“to attack”), from Middle Dutch bicken(“to stab, thrust, attack”) + -er(frequentative suffix), from Proto-Germanic *bikjaną (compare Old English becca(“pickax”), Dutch bikken(“to hack”), German picken(“to peck, pick at”), Old Norse bikkja(“to plunge into water”)), from Proto-Indo-European *bʰeg-(“to smash, break”). Compare also German Low German bickern(“to nibble, gnaw”).
From Scots bicker, from Middle English biker. Doublet of beaker.
etymonline
bicker (v.)
early 14c., bikere, "to skirmish, fight," perhaps from Middle Dutch bicken "to slash, stab, attack," + -er, Middle English frequentative suffix (as in blabber, hover, patter). Meaning "to quarrel, petulantly contend with words" is from mid-15c. Meaning "make a noisy, repeated clatter" is from 1748. Related: Bickered; bickering.
bicker (n.)
c. 1300, "a skirmish, a confused battle;" from the same source as bicker (v.). In modern use, often to describe the sound of a flight of an arrow or other repeated, loud, rapid sounds, in which sense it is perhaps at least partly echoic.
