noun A bag stitched to an item of clothing, used for carrying small items.
noun A person's financial resources.
I paid for it out of my own pocket.
noun An indention and cavity with a net sack or similar structure (into which the balls are to be struck) at each corner and one centered on each side of a pool or snooker table.
noun An enclosed volume of one substance surrounded by another.
The drilling expedition discovered a pocket of natural gas.
noun An area of land surrounded by a loop of a river.
noun The area of the field to the side of the goal posts (four pockets in total on the field, one to each side of the goals at each end of the ground). The pocket is only a roughly defined area, extending from the behind post, at an angle, to perhaps about 30 meters out.
noun The area behind the line of scrimmage subject to certain rules regarding intentional grounding, illegal contact, etc., formally extending to the end zone but more usually understood as the central area around the quarterback directly protected by the offensive line.
noun An area where military units are completely surrounded by enemy units.