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chock-a-block (adj.)
[chock-a-block 词源字典]
nautical, said of two blocks of tackle run so closely they touch; from
chock
+
block
(n.) in the nautical sense "a pulley together with its framework."
[chock-a-block etymology, chock-a-block origin, 英语词源]
[chock-a-block 词源字典]