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dotty (adj.)
[dotty 词源字典]
1812, "full of dots," from
dot
(n.) +
-y
(2). Meaning "silly" is from c. 1400, in
dotypolle
"dotty poll" (i.e. "dotty head"), in which case the first element is from
dote
(v.).
[dotty etymology, dotty origin, 英语词源]