Meaning

verb shake, quiver, or throb; move back and forth rapidly, usually in an uncontrolled manner

verb move or swing from side to side regularly

verb be undecided about something; waver between conflicting positions or courses of action

originThe adjective (then also used as a participle) is first attested in 1420, in Middle English, the verb in 1620; partly from Middle English vibrat(e) (“reverberant”), partly directly borrowed from Latin vibrātus, perfect passive participle of vibrō (“to agitate, set in tremulous motion”) (see -ate (etymology 1, 2 and 3)), ultimately from Proto-Indo-European *weyp- (“to oscillate, swing”) or *weyb-.

Etymology from Wiktionary, CC BY-SA 3.0