Abreast
adv.-
Side by side, with breasts in a line;
as, “Two men could hardly walk .”abreast - (Naut.) 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.

