wane

intransitive verb waned, waning

1. to grow gradually less in extent: said esp. of the visible face of the moon during the phases after full moon in which the lighted portion is gradually reduced to a thin crescent on the left, as seen from the Northern Hemisphere
2. to become less intense, bright, strong, etc.; grow dim or faint, as a light
3. to decline in power, importance, prosperity, influence, etc.
4. to approach the end: said of a period of time: the day wanes

noun

1. 1. the gradual decrease in the visible face of the moon after it has become full
   2. the time when this takes place
2. a gradual decrease in power, importance, intensity, etc., esp. after a gradual climb to a peak
3. a period of decline
4. the beveled, defective, bark-covered edge or corner of a board or plank cut from an unsquared log or block of wood