To Damp

1. (transitive, archaic) To dampen; to render damp; to make humid, or moderately wetSynonym: moisten
2. (transitive, archaic) To put out, as fire; to depress or deject; to deaden; to cloud; to check or restrain, as action or vigor; to make dull; to weaken; to discourage.
3. (transitive) To suppress vibrations (mechanical) or oscillations (electrical) by converting energy to heat (or some other form of energy).