- Side by side, with breasts in a line; as, "Two men could
hardly walk abreast." - Side by side; also, opposite; over against; on a line
with the vessel's beam; -- with of. - Up to a certain level or line; equally advanced; as, to
keep abreast of [or with] the present state of science. - At the same time; simultaneously.
Meaning of 'abreast' (Princeton's WordNet)
1 . abreast
[ s]
Meaning (1): - being up to particular standard or level especially in being up to date in knowledge