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abreast (adv.)
[abreast 词源字典]
mid-15c.,
on brest
, from
a-
(1) +
breast
(n.); the notion is of "with breasts in line." To
keep abreast
in figurative sense of "stay up-to-date" is from 1650s.
[abreast etymology, abreast origin, 英语词源]
[abreast 词源字典]