dampen
dam-pen
verb
To make something slightly wet or moist, often with water.
"She dampened the cloth to wipe the table."
verb
To make a feeling, enthusiasm, or sound less strong or intense.
"The bad news dampened everyone's spirits."
Thesaurus
Synonyms: stifle, damp, deaden, muffle, dull, tone down, mute, break, soften, weaken, wash, moisten