Veil of secrecy
Meaning
An effort to hide information.
Usage
Used to describe confidential operations.
Origin & History
Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.
Veils have long symbolized concealment.
Journalists used the phrase when reporting on espionage and covert deals.