Etymology
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dampen (v.)

1630s, "to dull or deaden, make weak" (force, enthusiasm, ardor, etc.), from damp (adj.) + -en (1). Meaning "to moisten, make humid" is recorded from 1827. Related: Dampened; dampening.

updated on June 25, 2018

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Definitions of dampen from WordNet

dampen (v.)
suppress or constrain so as to lessen in intensity;
Synonyms: stifle
dampen (v.)
make moist;
Synonyms: moisten / wash
dampen (v.)
deaden (a sound or noise), especially by wrapping;
Synonyms: muffle / mute / dull / damp / tone down
dampen (v.)
reduce the amplitude (of oscillations or waves);
dampen (v.)
make vague or obscure or make (an image) less visible;
Synonyms: deaden / damp
dampen (v.)
check; keep in check (a fire);
dampen (v.)
lessen in force or effect;
Synonyms: damp / soften / weaken / break
From wordnet.princeton.edu, not affiliated with etymonline.