bicker

From Middle English bikeren (“to attack”), from Middle Dutch bicken (“to stab, thrust, attack”) + -er (frequentative suffix), from Old Dutch bikken, from Proto-West Germanic bikkjan, from Proto-Germanic bikjaną, from Proto-Indo-European bʰeg- (“to smash, break”). See also Old English becca (“pickax”), Dutch bikken (“to hack”), German picken (“to peck, pick at”), Old Norse bikkja (“to plunge into water”); compare also German Low German bickern (“to nibble, gnaw”).

From Scots bicker, from Middle English biker. Doublet of beaker.