A‐breast″ (�), adv. [Pref. a- + breast.] 1. Side by side, with breasts in a line; as, “Two men could hardly walk abreast.” Macaulay.
2. (Naut.) Side by side; also, opposite; over against; on a line with the vessel's beam; — with of.
3. Up to a certain level or line; equally advanced; as, to keep abreast of the present state of science.
4. At the same time; simultaneously.
Abreast therewith began a convocation.
Fuller.