the.com/overstock

means To have more goods on hand than you can sell, forcing you to mark them down just to clear the shelves.

from A straightforward compound of 'over' (too much) plus 'stock,' the word for a merchant's store of goods — itself traced back to the Old English 'stocc,' meaning tree trunk or block, which came to mean a store of wealth or supply likely through the image of a solid, built-up reserve, like a woodpile you keep stacking until there's far more than you need.