(US) The practice of journalists of paying a person or organization for the receipt of a news story.

A list of tasks to be completed, names to be consulted, conditions to be verified and similar. / An inventory, especially of species.

(transitive) To add to a checklist.

One who checks or verifies something. / One who makes a check mark. / The clerk who tallies cost of purchases and accepts payment. / One who hinders or stops something.

A playing piece in the game of checkers (British: draughts). / A pattern of alternating colours as on a chessboard. / An individual square appearing in such a pattern.

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

The fruit of the wild service tree or chequer tree, Photinia villosa, syn. Sorbus terminalis

(computing) A software application, like a spellchecker, that attempts to verify the grammar in a document.

Divided into squares, or into light and dark patches. / (figuratively) Changeable; inconsistent; having variations or uncertainty; marked by many problems or failures.

simple past tense and past participle of checker