adverb
    
    along or close at the side
    
    
    
    alongside of
    
    chiefly US informal :next to or together with (someone or something) :alongside
    
    
    
    
    
    preposition
    
    next to (someone or something)
    
    
    
    along the side of (something)
    
    
    
    at the same time as (something) :together with (something)