alongside
UK: əˌlɒŋˈsaɪd | US: əˌlɔːŋˈsaɪd
adv. close to the side of; next to
prep. in parallel or cooperation with
The word "alongside" combines "along" (from Old English andlang, meaning "entire length" or "parallel to") and "side" (from Old English sīde, meaning "flank" or "edge"). Originally used in nautical contexts to describe ships positioned parallel to each other, it later broadened to denote general proximity or collaboration. The morphemes retain their literal spatial meanings but have expanded into abstract usage (e.g., working "alongside" someone).
The smaller boat sailed alongside the cruise ship.
She worked alongside experts to complete the project.
Park your car alongside the curb.
The two theories developed alongside each other.
He stood silently alongside his friend during the ceremony.