damp off

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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.
3. Archaic
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, damps
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).
Phrasal Verb:
damp off Botany
To be affected by damping off.

[Middle English, poison gas, perhaps from Middle Dutch, vapor.]

damp′ish adj.
damp′ly adv.
damp′ness n.

damp off

(Plant Pathology) (intr, adverb) (of plants, seedlings, shoots, etc) to be affected by damping off
References in periodicals archive ?
Seedlings will damp off (damping off is a fungal disease that can cause every plant in a seed tray or pot to collapse and die) if you sow too thickly.
She had been unable to breastfeed, and was saving up for formula milk and products to scrub the damp off the walls.
Hanging them from the sides of your shed can help keep the damp off them.