Reject (an offer) (8)
(Other definitions for turn down that I've seen before include "Dim - reject" , "prepare bed" , "Reject - reduce volume" , "Spurn" , "mark the place" .)
(Other definitions for turndown that I've seen before include "Decline; rejection" , "Dim - reject" , "Reject, or reduce volume as of radio" , "Reduce volume of sound - or reject request" , "Reject (offer); reduce adjustment" .)