Etymology
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mottle (n.)

"a pattern or arrangement of marks or blotches of different colors or shades," 1670s, probably a back-formation from motley.

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mottle (v.)

"to mark or cover with spots or blotches of different colors or shades," 1670s; see mottle (n.). Related: Mottled; mottling.

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mottled (adj.)

"dappled, marked with spots or patches of color of unequal intensity passing insensibly into one another," 1670s, past-participle adjective from see mottle (v.).

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