Turn down garbage (6)
I believe the answer is:
refuse
I believe this is a double definition.
'turn down' is the first definition.
(synonyms)
'garbage' is the second definition.
(synonyms)
(Other definitions for refuse that I've seen before include "Decline, repudiate" , "Pass up" , "Reject the waste material" , "Don't take the rubbish" , "household rubbish" .)