Meaning : A secret or underhand means of access (to a place or a position).
Example :
He got his job through the back door.
Synonyms : backdoor
Meaning : An undocumented way to get access to a computer system or the data it contains.
Synonyms : backdoor
Meaning : An entrance at the rear of a building.
Synonyms : back entrance, backdoor
Back door meaning in Bengali (Bangla).