alongside

adv

1. (not-comparable)Along the side; by the side; side by side; abreast.

   “Ahoy! Bring your boat alongside.”

   “All of a sudden, another car drew up alongside.”

prep

1. Side by side with.
2. Together with or at the same time.

   “The nurse worked alongside the doctor.”

   “The Italian opted for Bolton's Cahill alongside captain John Terry - and his decision was rewarded with a goal after only 13 minutes. Bulgaria gave a hint of defensive frailties to come when they failed to clear Young's corner, and when Gareth Barry found Cahill in the box he applied the finish past Nikolay Mihaylov.”

   “A “moving platform” scheme […] is more technologically ambitious than maglev trains even though it relies on conventional rails. Local trains would use side-by-side rails to roll alongside intercity trains and allow passengers to switch trains by stepping through docking bays.”

   “Gatwick, on the other hand, is alongside the Brighton main line, with rail services both to the north (City and West End) and south.”