Definition of: blight

(blīt) noun
1. Any of a number of destructive plant diseases, as mildew, rust, smut, etc.
2. Anything that withers hopes or prospects; also, the act of ruining or destroying.
3. A minute insect, usually an aphis, injurious to trees.
4. A deteriorating influence or condition affecting use, development, and value, as of real estate.
—v.t.
1. To cause to decay; blast.
2. To ruin; frustrate.
—v.i.
3. To suffer blight. [Origin unknown]