IPA: /ˈoʊvərstɒk/
KK: /ˈoʊvərstɑk/
A situation where there is more of a product available than is needed or can be sold.
The store had to discount prices to clear the overstock of winter clothing.
To supply or store more of something than is needed or wanted.
The store decided to overstock its shelves with holiday decorations this year.
Past: overstocked
Past Participle: overstocked
Overstock → It is formed from "over-" (meaning excessively or too much) and "stock" (from Old English *stoc*, meaning a supply or store). The word "overstock" means to have an excessive supply or too much stock of something.
Think of having 'too much' ('over-') of a 'supply' ('stock') — that's why overstock means having an excessive amount.
No commonly confused words.