up and down

Entry Definition
s/he, it bobs up and down in water
(person standing up or walking) s/he bounces h/ up and down (child held in arms)
(person seated) s/he bounces h/ up and down (e.g., child sitting on lap)
(person seated) s/he bounces h/ up and down (e.g., child held in arms)
s/he jumps up and down on it (something springy: bed, trampoline, etc.)
s/he jumps up and down quickly