ˈ ̷ ̷ˌ ̷ ̷ noun
Etymology: heel (I) + tap
1. : a lift for the heel of a shoe
2.
a.
(1) : a small quantity of liquor remaining in a drinking glass
(2) : a small quantity of liquor remaining in a bottle, cask, or other storage vessel
b. : dregs
3. : an imperfection in the glass bottom of a bottle marked by inequalities of thickness