means A hole or hollow in the ground or a surface — or, in fruit, the hard stone at the center.

from From Old English 'pytt,' a hole or hollow, borrowed early from Latin 'puteus,' a well or pit. The fruit-stone sense is a separate, later arrival — likely from Dutch 'pit,' meaning kernel or core — so English ended up with two 'pits' that look identical but come from different family trees, one a hole and one a heart.