Quick action by the increasingly professional Lebanese Army put a dampener on the clashes.
Then he had the sense to see that it was he, Gerald, who acted as a spoil-feast, a dampener.
She was beautiful and attractive, and he had feared she might be ugly, which would have been a dampener on his satisfaction.
1887, agent noun from dampen.
1630s, "to dull or deaden" (of force, enthusiasm, ardor, etc.), from damp (adj.) + -en (1). Meaning "to moisten" is recorded from 1827. Related: Dampened; dampening.