abreast

1. side by side; beside each other in a line
2. equal to or alongside in progress, attainment, or awareness (usually fol. by of or with)

1.They walked two abreast down the street.

2.To keep abreast of scientific developments; keeping abreast with the times.

abreast

A single breast. Opposite of two breasts.

"Hey look! Abreast!"