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abreast (adv.)

mid-15c., a contraction of on brest "side-by-side," 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.

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Definitions of abreast from WordNet
1
abreast (adv.)
alongside each other, facing in the same direction;
2
abreast (adj.)
being up to particular standard or level especially in being up to date in knowledge;
kept abreast of the latest developments
Synonyms: au courant / au fait / up on
From wordnet.princeton.edu