fly on the wall
In real, traceable use. Part of the curated seed collection; community review is coming.
Meaning · English
To join an otherwise private interaction, unnoticed to watch and/or listen to something.
Nghĩa · Tiếng Việt
tham gia và quan sát một cuộc trao đổi riêng tư
Machine-translated — suggest a fix
Where it’s used:
Used
Widespread English
Sources & notes
Imported from Wikipedia “English-language idioms” (CC BY-SA 4.0, retrieved 2026-07-29), pending review.
Common questions
What does “fly on the wall” mean?
To join an otherwise private interaction, unnoticed to watch and/or listen to something.
Is “fly on the wall” formal or informal?
No register label has been reviewed yet — treat it as neutral and check the usage notes above.