To carry out a decision recorded through the process of checking off an item on a list, including dealing with it, removing it from the possible choices, or removing the not checked items from further consideration.
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); to tick off (UK), tick (UK), cross off, strike off.
To deduct union members' dues from their wages.
to show the steps taken to create a logical argument or equation.
to show, display, or present; to prove or make evident
to show how to use (something).
to participate in or organize a demonstration.