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spotty (adj.)
[spotty 词源字典]
mid-14c., "marked with spots," from
spot
(n.) +
-y
(2). Meaning "unsteady, uneven" is attested from 1932, from a more specific use with reference to painting (1812).
[spotty etymology, spotty origin, 英语词源]
[spotty 词源字典]