n. Some influence, usually hidden or not conspicuous, that nips, blasts, or destroys plants; a diseased state of plants caused by the condition of the soil, atmospheric influences, insects, parasitic plants, etc.; smut, mildew, or the like.n. Figuratively, any malignant or mysterious influence that nips, blasts, destroys, or brings to naught; anything which withers hope, blasts one's prospects, or checks prosperity.n. . In medicine: A slight facial paralysis induced by sudden cold or damp.n. See blights.To affect with blight; cause to wither or decay; nip, blast, or destroy.To exert a malignant or baleful influence on; blast or mar the beauty, hopes, or prospects of; frustrate.n. Purulent conjunctivitis.n. An insect, usually inconspicuous or hidden, which causes trees or plants to become diseased or to die, as the American blight.n. Same as mosquito blight. See also tea-bug.