noun / verb
wallop
WAH-lup/wˈɑlʌp/
A powerful blow or impact.
The boxer's wallop compresses the punching bag and drives it sideways.

Etymology
Wallop meaning “hit hard” may be a separate, sound-imitating coinage from the earlier verb meaning “gallop.” A connection through quick, heavy movement is suggested, but not established.
More examples
- A loose branch wallops the roof during the storm.
- Our team walloped the visitors, winning by thirty points.
- The movie's quiet ending packs an emotional wallop.
Forms
wallop · wallops · walloped · walloping