- n. idiomatic A possession or financial commitment that creates substantial ongoing expenses, especially one whose costs are considered to be unsustainable.
- n. sometimes capitalized Long-standing nickname of a complicated, seemingly man-made excavation on Oak Island in Nova Scotia, Canada, rumored to contain pirate treasure and which has been repeatedly and unsuccessfully probed at great expense.
“The Search for Extraterrestrial Intelligence was NASA's most abysmal money pit ever.”
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