Webster’s Revised Unabridged Dictionary · 1913
Heeltap
Heel′tap′ (·tăp′), n. 1. One of the segments of leather in the heel of a shoe.
2. A small portion of liquor left in a glass after drinking. "Bumpers around and no heeltaps." Sheridan.
Heel′tap′, v. t. [imp. & p. p. Heeltapped; p. pr. & vb. n. Heeltapping.] To add a piece of leather to the heel of (a shoe, boot, etc.)