/ əˌlɒŋˈsaɪd; NAmE əˌlɔːŋ-/ preposition
1.
next to or at the side of sth :
A police car pulled up alongside us.
2.
together with or at the same time as sth/sb :
Traditional beliefs still flourish alongside a modern urban lifestyle.
► along·side adverb :
Nick caught up with me and rode alongside.