Every Saturday I’ll give you a couple of idioms to learn. An idiom is a saying or phrase whose meaning cannot be taken from the literal meanings of the words.
in stock: inventory available for sale, on hand.
Example:
Call the office supply store and see if they have toner for our printer in stock.
out of stock: no inventory available for sale.
Example:
That particular camera model is out of stock, but we’re expecting a new shipment early next week.