verb
pummel
PUM-ul/ˈpʌml/
To attack with repeated heavy blows, physically or figuratively.
The boxer pummels a padded training bag.

Etymology
A pomel was a rounded knob, such as the end of a sword hilt. To pummel was to beat with or as with such a knob, hence to strike repeatedly.
In context
Water would pummel the valley as the lake emptied its some 4.5 million cubic meters of water
More examples
- Hail pummeled the greenhouse roof.
- Waves continued to pummel the sea wall.
- The fighter was pummeling his opponent's raised guard.
Forms
pummel · pummels · pummeled · pummeling