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yard-arm (n.)
[yard-arm 词源字典]
also
yardarm
, 1550s, from
yard
(n.2) in the nautical sense (attested from Old English) +
arm
(n.1). In 19c. British naval custom, it was permissible to begin drinking when the sun was over the yard-arm.
[yard-arm etymology, yard-arm origin, 英语词源]