abreast vs straight ahead

abreast

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

• Side by side and facing forward. 

• Alongside; parallel to. 

• Informed, well-informed, familiar, acquainted. 

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

• Breast high (of an advancing wave). 

• Up to a certain level or line; equally advanced 

• Alongside; parallel to. 

• Informed, well-informed, familiar, acquainted. 

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

• Side by side, facing forward. 

• Abreast of; alongside. 

straight ahead

• directly ahead, without deviation