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 make particular, as opposed to general; to restrict to a specific or individual case, class etc.; to single out.
To differentiate, make distinct from others.
To be specific about (individual instances); to go into detail (about), to specify.