Definitions of check
(US) a signed written order by its maker directing a bank to pay a specified sum to a named person or to that person's order on demand
Can I pay by check?
a bill (eg in a restaurant)
I'll get the check (=I'll pay the bill).
the action of stopping, slowing down, limiting or otherwise controlling the actions, behaviour or growth of someone or something
The president's veto power is an important check on Congress.