He did the backdoor deals that allowed the government to get its budget through Parliament
He brushed aside talk of greedy MPs voting themselves a backdoor pay rise.
2. singular noun
If you say
that someone is doing something through or by the backdoor
, you disapprove of them because they are doing it in a secret, indirect, or dishonest
Dentists claim the Government is privatising dentistry through the back door.
COBUILD Advanced English Dictionary. Copyright © HarperCollins Publishers