drub 
(drŭb)
(drŭb)v. drubbed, drub·bing, drubs
v.tr.
1. To thrash with a stick.
2. To instill forcefully: drubbed the lesson into my head.
3.
a. To defeat soundly.
b. To berate harshly.
4. To stamp (the feet).
v.intr.
1. To beat the ground; stamp.
2. To pound; throb.
n.
A blow with a heavy instrument, such as a stick.
[Perhaps Arabic dialectal ḍrab, from ḍaraba, to hit; see rb in the Appendix of Semitic roots.]
drubber n.