v. t.
In a way that considerably dampened our enthusiasm. The Century. [ 1913 Webster ]
v. i. To become damp; to deaden. Byron. [ 1913 Webster ]
n. the act or process of making something slightly wet.
n. That which damps or checks;
Nor did Sabrina's presence seem to act as any damper at the modest little festivities. W. Black. [ 1913 Webster ]