blotch

Meanings

1. 1
   noun

   an irregular patch or spot of color, staining, or discoloration

   A red blotch appeared on his arm after the hike.

2. 2
   verb

   to mark or cover a surface with irregular patches or spots

   Heavy rain can blotch the unfinished watercolor.

The origin is uncertain. It may be a blend of blot and botch, both of which carried senses involving stains, patches, or clumsy marks.

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