Definitions:
a large hole in the ground.

a hollow or indentation in a surface.

an area at the side of a track where racing cars are serviced and refuelled

an orchestra pit.

a part of the floor of a stock exchange in which a particular stock or commodity is traded

an enclosure in which animals are made to fight

a person's bed.

a person's armpit.

set someone or something in conflict or competition with

make a hollow or indentation in the surface of

drive a racing car into the pits for fuel or maintenance

the stone of a fruit

remove the pit from (fruit).