tup 
(tŭp)
(tŭp)n.
1. Chiefly British A male sheep; a ram.
2. A heavy metal body, especially the head of a power hammer.
v. tupped, tup·ping, tups
v.tr.
To copulate with (a ewe). Used of a ram.
v.intr.
To copulate with a ewe.
[Middle English tupe.]