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top-notch (adj.)
[top-notch 词源字典]
also
top notch
, 1848, from
top
(adj.) +
notch
(n.). Figurative of the "highest point" of something, but the exact mechanical image is uncertain.
[top-notch etymology, top-notch origin, 英语词源]
[top-notch 词源字典]