something that stands in one’s way; an obstacle

a person who walks across the street on foot

a foot treatment that could include soaking the feet and polishing the toenails 

a four- footed creature 

a three- footed stand often used to balance a camera

The steps were a(n) ____________ to the girl on crutches trying to get to class.

Mammals such as cattle, cats, and reptiles, like lizards are

Humans, kangaroos and primates are

Vehicles must yield the right-of-way to ____________ at plainly marked crosswalks.