Wiktionary
down cellar
adv. (cx idiom English) downstairs; the opposite of upstairs.
Usage examples of "down cellar".
Then he looked thoughtfully at the tap with the H on its handle, and decided to go down cellar and see what sort of magnificent water heater Bobbi had put in.
His father's old butler - who was there with other reacquired servant - told me one day that Edward's occasional prowlings about the house, and especially down cellar, looked odd and unwholesome to him.
When Father needed a hired man, they worked for him and he paid them with salt pork from the barrels down cellar.
Addie kept her preserves down cellar and that was just too many stairs).