As a general rule a chair would have 4 legs, a stool would have 3.
The answer is a bed. A bed has four legs, it sits on the floor with its legs, and "waits" for someone's legs to come and lie down on it.
a chair
You will have five chairs if there are four legs on each chair.
It just does.
Person bringing a chair in.
Return with a chair
the guy who fell over with a 3 leg chair
A Table or a Chair.
a chair
A chair.
An armchair