alongside · adverb /əˈlɑŋˌsɑɪd/
alongside (NEXT TO)
C1 next to someone or something
Dictionary example:
A car pulled up alongside ours.
Learner example:
The skyline [is] filled with huge chimneys displacing tons of gases into the air; millions of vehicles [are] moving on a highway alongside a dead river, where life flourished a few decades ago. (Certificate in Advanced English; C1; Portuguese)
alongside (WITH)
C1 together with someone
Dictionary example:
She enjoyed working alongside such famous actors.
Learner example:
Also he worked alongside me at another travel agency for 6 months. (International English Language Testing System; C1; Urdu)