What is the meaning of Abreast?

Side by side and facing forward.

Alongside; parallel to.

Informed, well-informed, familiar, acquainted.

Followed by of or with: up to a certain level or line; equally advanced.

Breast high (of an advancing wave).

Side by side; also, opposite; on a line with the vessel's beam.

At the same time; simultaneously.

Side by side, facing forward.

Alongside; parallel to.

Informed, well-informed, familiar, acquainted.

Up to a certain level or line; equally advanced

Side by side; also, opposite; over against; on a line with the vessel's beam.

Abreast of; alongside.

Source: wiktionary.org