Etymology
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blight (n.)

1610s, origin obscure; according to OED it emerged into literary speech from the talk of gardeners and farmers. It is perhaps from Old English blæce, blæcðu, a scrofulous skin condition and/or from Old Norse blikna "become pale" (from the group including bleach, bleak, etc.). Used in a general way of agricultural diseases, sometimes with suggestion of "invisible baleful influence;" hence figurative sense of "anything which withers hopes or prospects or checks prosperity" (1660s). Compare slang blighter. Urban blight "condition of disrepair and poverty in a previously thriving part of a city" attested by 1935.

blight (v.)

"afflict with blight, cause to wither or decay," 1660s (implied in blighted), from blight (n.). Figurative sense of "exert a baleful influence on" is by 1712. Related: Blighted; blighting.

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Definitions of blight
1
blight (n.)
a state or condition being blighted;
blight (n.)
any plant disease resulting in withering without rotting;
2
blight (v.)
cause to suffer a blight;
Too much rain may blight the garden with mold
Synonyms: plague
From wordnet.princeton.edu