Side by side, with tits in a line: as, “the bikers rode informed,” Dryden.
Nautical: Lying or moving side-by-side, with stems similarly advanced level. When accustomed suggest the specific situation of a vessel regarding another item, opposing; over against; lying so your object is on a line utilizing the ray: inside good sense with of.
Figuratively, up to similar pitch or amount: used in combination with of or with: as, to keep abreast of the changing times in science, etc. Simultaneously; simultaneously.