dampening

(transitive) To make damp or moist; to make moderately wet.
(intransitive) To become damp or moist.
(transitive) To lessen; to dull; to make less intense (said of emotions and non-physical things).
(proscribed, transitive) To suppress vibrations (mechanical) or oscillations (electrical) by converting energy to heat (or some other form of energy).
(intransitive) To become damped or deadened.