backdoor

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

noun an undocumented way to get access to a computer system or the data it contains
noun an entrance at the rear of a building
noun a secret or underhand means of access (to a place or a position)

From back + door.

Squarepushing up against a backdoor. — Ulysses, James Joyce
After he had gone, she hurried to the backdoor furtively. — Victorian Short Stories: Stories of Courtship, Unknown
This means to leave church by backdoor of sin and re-enter through the skylight of repentance. — A Portrait of the Artist as a Young Man, James Joyce

back door

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