1. A person who is always hungry. Her teenage son was like a bottomless pit as he devoured every last bit of food in the house.
2. A situation that requires a seemingly endless amount of money or resources. With all the money and time we've sunk into repairs for the roof, windows, and foundation, this house has become a bottomless pit.
someone or something that always needs or wants more of whatever they are given, especially money It's a poor country with a bottomless pit of debt.Seb'll eat any food that's left over. He's a bottomless pit!