It's not quite right to get discount (1,3,3)
I believe the answer is:
a bit off
I believe this is a double definition.
'it's not quite right' is the first definition.
'discount' is the second definition.
(I have seen 'Small discount' mean 'a bit off' so perhaps 'discount' could also mean 'a bit off')
'to get' acts as a link.
(Other definitions for a bit off that I've seen before include "in poor taste" , "Small discount" , "not very polite" , "Substandard" , "unacceptable!" .)