Deny, turn down (6)
I believe the answer is:
refuse
I believe this is a double definition.
'deny' is the first definition.
(deny can mean to refuse or reject)
'turn down' is the second definition.
(I know that turn down can be written as refuse)
(Other definitions for refuse that I've seen before include "Don't take the rubbish" , "Decline to jump; rubbish" , "Decline to jump (a fence)" , "Trash" , "Junk" .)