an attendant who checks coats or baggage
"The hotel staff member at the entrance acted as a checker, greeting guests and taking their heavy coats before they entered the lobby."
one who checks the correctness of something
"The senior accountant hired a checker to verify all the figures before filing the tax return."
One who checks or verifies something.
"The hikers found a rare red checker growing on the old hedgerow near the stream."
A playing piece in the game of checkers (British: draughts).
The fruit of the wild service tree or chequer tree, Photinia villosa, syn. Sorbus terminalis
In plain English: A checker is someone who watches over others to make sure they follow the rules and do their jobs correctly.
"The checker was busy at the counter verifying every item in our order before we paid."
Usage: Use "checker" to refer specifically to a single playing piece in the board game known as checkers or draughts. Do not use this term for the fruit of the wild service tree, which is distinct from both the game and its pieces.
To mark in a pattern of alternating light and dark positions, like a checkerboard.
"The gardener checked the garden beds by planting flowers in an alternating pattern of white daisies and purple petunias."
In plain English: To check something is to look at it carefully to see if everything is correct or safe.
"She checked her work twice before handing in the exam, just to be sure everything was correct."
The word checker is formed by adding the suffix -er to check. It originally referred to a person who performs the action of checking something.