<p><strong>Adverb</strong></p><ul><li>side by side</li><li>beside each other in a line: They walked two abreast down the street.</li></ul><p><strong>Definition</strong></p><ul><li>equal to or alongside in progress, attainment, or awareness (usually followed by of or with):<ul><li>to keep abreast of scientific developments</li><li>keeping abreast with the times</li></ul></li></ul>