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slapdash (adv.)
[slapdash 词源字典]
1670s, from
slap
(v.) +
dash
(v.). As an adjective, "dashing, offhand, careless," from 1792. As a noun, "rough-coat, coarse plaster," from 1796.
[slapdash etymology, slapdash origin, 英语词源]
[slapdash 词源字典]