n (archaic|mining) A gaseous product, formed in coal mines, old wells, pits, etc.
v (transitive|archaic) To dampen; to render damp; to moisten; to make humid, or moderately wet; as, to damp cloth.
v (transitive|archaic) To put out, as fire; to depress or deject; to deaden; to cloud; to check or restrain, as action or vigor; to make dull; to weaken; to discourage.
v (transitive) To suppress vibrations (mechanical) or oscillations (electrical) by converting energy to heat (or some other form of energy).