verb
(intransitive) To vary irregularly; to swing.
(intransitive) To undulate.
(intransitive) To be irresolute; to waver.
(transitive) To cause to vary irregularly.
(rare, figuratively, also literally) To rise and fall as a wave; to be tossed up and down the waves.
adjective
Tossed up and down the waves.
(by extension) Wavering, fickle.