alongside 2023.03.13 Meaning of alongside in English Adverb US /əˈlɔŋˈsaɪd/ UK /əˈlɒŋˈsaɪd/ 1. by the side; side by side The children lined up alongside the teacher. Preposition US /əˈlɔŋˈsaɪd/ UK /əˈlɒŋˈsaɪd/ 1. next to Put your bike alongside mine.