1 : an opening at the corner or on the side of a billiard table into which billiard balls are struck
2 : (anatomy) saclike structure in any of various animals (as a marsupial or gopher or pelican)
3 : a local region of low pressure or descending air that causes a plane to lose height suddenly
4 : a hollow concave shape made by removing something
5 : an enclosed space
1 : put in one's pocket