Wordnet 3.0
NOUN (1)
1. 
 something doomed to failure; 
- Example: "he finally admitted that the legislation was a dead duck"- Example: "the idea of another TV channel is now a dead duck"- Example: "as theories go, that's a dead duck"
WordNet (r) 3.0 (2006):
dead duck
    n 1: something doomed to failure; "he finally admitted that the
         legislation was a dead duck"; "the idea of another TV
         channel is now a dead duck"; "as theories go, that's a dead
         duck"