IPA: /ˈfʊt.fɔːl/
KK: /ˈfʊtˌfɔl/
The sound made by someone walking, or the number of people who enter a place in a certain time.
The footfall of shoppers could be heard throughout the store during the holiday season.
Footfall is formed from "foot" (from Old English "fōt", meaning the lower limb of the body) and "fall" (from Old English "feallan", meaning to drop or descend). The word "footfall" refers to the sound or act of a foot striking the ground, typically when walking or running.
Think of the sound made when a 'foot' ('fōt') 'falls' ('feallan') to the ground — that's what footfall means.