This is the 1144th most frequent Korean word.
발
"발" means "foot" in English.
Here, '발' refers to the physical feet used during the sport.
나는 축구를 할 때 발을 잘 사용합니다.
I use my feet well when I play soccer.
'발로' emphasizes the usage of '발' (foot) as the instrument for kicking the door.
그는 너무 화가 나서 문을 발로 찼어요.
He was so angry that he kicked the door with his foot.
In this idiomatic usage, '발을 구르다' (stamping feet) represents restlessness or frustration.