intransitive verb

1. to swing or sway to and fro; flutter
2. to show doubt or indecision; find it hard, or be unable, to decide; vacillate
3. to become unsteady; begin to give way; falter
4. to tremble; quaver: said of the voice, etc.
5. to vary in brightness; flicker: said of light
6. to fluctuate
7. to totter

Etymology: ME waveren, freq. of waven, to wave

noun