{v. phr.} To sell something to people who already have a large quantity of the same or similar goods. * /My Alaskan friend said, "One of the hottest businesses in Alaska is refrigeration. You could say that I, as a refrigerator expert, am selling snow to the Eskimos."/ See: CARRY COALS TO NEWCASTLE.
SELL SNOW TO THE ESKIMOS
Meaning of SELL SNOW TO THE ESKIMOS in English
Dictionary of English idioms . Словарь английских идиом. 2012