alongside

1 alongside /əˈlɑːŋˈsaɪd/ adverb
1 alongside
/əˈlɑːŋˈsaɪd/
adverb
Britannica Dictionary definition of ALONGSIDE
: along or close at the side

alongside of

chiefly US, informal
: next to or together with (someone or something) : alongside
2 alongside /əˈlɑːŋˈsaɪd/ preposition
2 alongside
/əˈlɑːŋˈsaɪd/
preposition
Britannica Dictionary definition of ALONGSIDE
1 
: next to (someone or something)
2 
: along the side of (something)
3 
: at the same time as (something) : together with (something)