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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

damp off

(Plant Pathology) (intr, adverb) (of plants, seedlings, shoots, etc) to be affected by damping off
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
You may have already discovered that all plants with grey leaves will damp off easily and will root faster out of the sun.
She recalled: "The council said it was our fault for not cleaning the damp off the furniture and declined an insurance claim for the damages.
Seedlings will damp off - a fungal disease that can cause every plant in a seed tray or pot to collapse and die - if you sow too thickly.