pit

a sizeable hole (usually in the ground)

• “they dug a pit to bury the body”

a concavity in a surface (especially an anatomical depression)

the hard inner (usually woody) layer of the pericarp of some fruits (as peaches or plums or cherries or olives) that contains the seed

• “you should remove the stones from prunes before cooking”

a trap in the form of a concealed hole

a surface excavation for extracting stone or slate

• “a British term for”
• “is”
• “'”

an ointment containing mercury

a workplace consisting of a coal mine plus all the buildings and equipment connected with it

set into opposition or rivalry

• “let them match their best athletes against ours”
• “pit a chess player against the Russian champion”
• “He plays his two children off against each other”

mark with a scar

• “The skin disease scarred his face permanently”

remove the pits from

• “pit plums and cherries”