examine (something) in order to determine its accuracy, quality, or condition, or to detect the presence of something

customs officers have the right to check all luggage

a simple blood test to check foranaemia

stop or slow the progress of (something, typically something undesirable)

efforts were made to check the disease

(of a passenger) consign (baggage) to the care of the transport provider with whom they are travelling

I checked my bag and got my boarding pass

mark or click on (a box) in order to select a particular option on a form, questionnaire, etc.

users who want privacy should check the box that prevents your files from being shared

move a piece or pawn to a square where it attacks (the opposing king)

he moves his knight to check my king again

(in poker) choose not to make a bet when called upon, allowing another player to do so instead

(of a hound) pause to make sure of or regain a scent