dampen

verb

Etymology: Etymology tree English damp English -en English dampen From damp + -en.

1. To make damp or moist; to make moderately wet.
2. To become damp or moist.
3. To lessen; to dull; to make less intense (said of emotions and non-physical things).

   “We won't let the bad news dampen our spirits.”

   “He was dreadfully familiar with everything, and talked about some places we were longing to see in a way that considerably dampened our enthusiasm.”

4. To suppress vibrations (mechanical) or oscillations (electrical) by converting energy to heat (or some other form of energy).
5. To become damped or deadened.