Значение идиомы sell snow to the Eskimos

[sell snow to the Eskimos] {v. phr.} To sell something to peoplewho already have a large quantity of the same or similar goods.

MyAlaskan friend said, “One of the hottest businesses in Alaska isrefrigeration. You could say that I, as a refrigerator expert, amselling snow to the Eskimos.”

See: CARRY COALS TO NEWCASTLE.