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adj. damp·er, damp·est
1. Slightly wet: a damp sponge.
2. Humid: damp air.
3. Archaic Dejected; depressed.
a. Moisture in the air; humidity: Come in out of the damp.
b. Moisture that lies or has condensed on something: "I saw the damp lying on the bare hedges and spare grass" (Charles Dickens).
2. Foul or poisonous gas that sometimes pollutes the air in coal mines.
a. Lowness of spirits; depression: "An angry or sorrowful [countenance] throws a sudden damp upon me" (David Hume).
b. A restraint or check; a discouragement: "The issue of arms was so slow as to throw a great damp upon volunteering" (James Franck Bright).
tr.v. damped, damp·ing, dampsPhrasal Verb:
1. To make damp or moist; moisten.
2. To suppress or extinguish (a fire) by reducing or cutting off air.
3. To restrain or check; discourage: news that damped our enthusiasm.
4. Music To slow or stop the vibrations of (the strings of a keyboard instrument) with a damper.
5. Physics To decrease the amplitude of (an oscillating system).
damp off Botany
To be affected by damping off.
[Middle English, poison gas, perhaps from Middle Dutch, vapor.]