IPA: /ˈfʊtbæɡ/
KK: /ˈfʊtbæɡ/
A small round bag filled with pellets or other materials, used in games where players keep it in the air using their feet.
He practiced his footbag skills in the park every afternoon.
Footbag is formed from "foot" (from Old English "fōt", meaning the lower extremity of the leg) and "bag" (from Old Norse "baggi", meaning a sack or pouch). The word "footbag" refers to a small bag that is typically kicked with the foot, often used in games like hacky sack.
Think of a 'bag' that is meant to be used with your 'foot' — that's why a footbag is a bag you kick with your foot.
No commonly confused words.