next to the side of something:
A car drew up alongside.
Children's prices are shown alongside adult prices.
used to say that people or things do something or exist together at the same time:
Charles spent a week working alongside the miners.
Organized crime continued to flourish alongside the mainstream economy.
in comparison with something:
His achievement may seem small alongside the great triumphs of 20th century technology.
Athletics should rank alongside (=be equal to) soccer and cricket as a major sport.