turndown /ˈtɝnˌdaʊn/noun 5adjective 2forms 1 noun5 •The service of turning down the bedcovers and often leaving chocolates, etc., on the pillow.Also, the amenities vary between the paradors: almost all that we visited had hairdryers, many had small refrigerators in the room, and some even had bathrobes and turndown service. — 2006 •A downturn.In past recessions, drugstores were virtually immune from a turndown. — 2009 •A rejection. •The operational range of a device. •A downward pointing extension to a vehicle muffler. adjective2 •Made to wear with the upper part turned down. •Capable of being turned down, or decreased in intensity.a turndown lamp formsturndowns