heeltap

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A layer of leather or wood added to raise the heel of a shoe; a lift.
• noun A small amount of liquor remaining in a container or drinking vessel.

from The Century Dictionary.

• noun A small piece of leather several of which together form the heel of a shoe; a lift. See heel
• noun The small portion of wine or liquor left in a glass when the main portion has been drunk.
• To add a piece of leather to the heel of, as a shoe or boot.

from the GNU version of the Collaborative International Dictionary of English.

• noun One of the segments of leather in the heel of a shoe.
• noun A small portion of liquor left in a glass after drinking.
• transitive verb To add a piece of leather to the heel of (a shoe, boot, etc.)

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A piece or wedge that raises the heel of a shoe.
• noun dated A small amount of (especially alcoholic) drink remaining at the bottom of a glass.
• verb transitive To add a piece of leather to the heel of (a shoe, boot, etc.).