ram 
(răm)
(răm)n.
1. A male sheep.
2. Any of several devices used to drive, batter, or crush by forceful impact, especially:
a. A battering ram.
b. The weight that drops in a pile driver or steam hammer.
c. The plunger or piston of a force pump or hydraulic press.
3. A hydraulic ram.
4.
a. A projection on the prow of a warship, used to batter or cut into enemy vessels.
b. A ship having such a projection.
5. Ram See Aries.
tr.v. rammed, ram·ming, rams
1. To strike or drive against with a heavy impact; butt: rammed the door with a sledgehammer until it broke open.
2. To force or press into place.
3. To cram; stuff: rammed the clothes into the suitcase.
4. To force passage or acceptance of: rammed the project through the city council despite local opposition.
[Middle English, from Old English ramm.]
rammer n.