noun

• (chess) A situation in which the king is directly threatened by an opposing piece.
• (US) A mark (especially a checkmark: ✓) used as an indicator.
  "Norton had made a neat, lawyerly check beside each of the items he and Billy had picked up—half a dozen or so, including the milk and a six-pack of Coke."
• (US) An order to a bank to pay money to a named person or entity.
  "I was not carrying cash, so I wrote a check for the amount."
• (US) A bill, particularly in a restaurant.
  "I summoned the waiter, paid the check, and hurried to leave."

verb

• (transitive) To inspect; to examine.
  "Check the oil in your car once a month."
• (transitive) To verify the accuracy of a text or translation, usually making some corrections (proofread) or many (copyedit).
• (transitive, US, often used with "off") To mark items on a list (with a checkmark or by crossing them out) that have been chosen for keeping or removal or that have been dealt with (for example, completed or verified as correct or satisfactory).
  "Check the items on the list that interest you."
• (transitive) To control, limit, or halt.
  "Check your enthusiasm during a negotiation."

noun

• (textiles, usually pluralized) A pattern made up of a grid of squares of alternating colors; a checkered pattern.
  "The tablecloth had red and white checks."

verb

• (transitive) To mark with a check pattern.