To engage in petty, peevish arguing, usually repeated and ongoing. The siblings would often bicker over who got to sit in the front seat of the car.
To move or flow with a gentle, rapid pattering or flickering sound, as of water or flames (literary). Sparks bickered in the fireplace as the wood settled.
(archaic) To fight or skirmish, especially briefly or lightly. Border raiders would sometimes bicker with the town's militia before retreating.