undercut

1. A cut made in the lower part of something; the material so removed.
2. The notch cut in a tree to direct its fall when being felled.
3. The underside of a sirloin of beef; the fillet.
4. A hairstyle that is shaved or clipped short on the sides and kept long on the top.
5. A blow dealt upward.
6. A section of a mold or pattern with negative draft angle
7. A pit stop strategy in which a driver seeks to gain an advantage over someone by pitting before them and using fresh tyres to make up time.
8. The continuation of the saddle of a rabbit's coat toward the front legs.

الجمع undercuts