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Related to mottler: muddler
tr.v. mot·tled, mot·tling, mot·tles
To mark with spots or blotches of different shades or colors.
1. A spot or blotch of color.
2. A variegated pattern, as on marble.
[Probably back-formation from motley.]
1. a paintbrush used to achieve a mottled effect
2. a person employed to make something appear mottled