checker

One who or that which checks or verifies something.

So, keep in mind that Microsoft Word’s Spelling tool is as much a “typo” tool as a checker of spelling.

One who makes a check mark.

"Essentially," said a senior vice president of the FHLBB of Dallas, "we were checkers of boxes."

The clerk who tallies cost of purchases and accepts payment.

There was a long line at the grocery store because the checker was so slow.

Bud Brown said something to the checker he was supervising; she had been craning around to see what was happening. She flushed and began to run her calculator again.

One who hinders or stops something.

A playing piece in the game of checkers (British: draughts), or certain other table games such as backgammon.

A pattern of alternating colours as on a chessboard.

An individual square appearing in such a pattern.

To mark in a pattern of alternating light and dark positions, like a checkerboard.

To develop markings in a pattern of alternating light and dark positions, like a checkerboard.