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to keep something under one's hat
01
to avoid sharing a secret with others
Idiom
InformalWhat is the origin of the idiom "keep something under one's hat" and when to use it?
The idiom "keep something under one's hat" has its origins in the imagery of concealing information beneath one's hat to prevent others from seeing or knowing about it. The phrase emerged in the late 19th century and is associated with the practice of secretiveness or discretion. The expression is now used to suggest the idea of holding onto a piece of information privately, similar to hiding it beneath one's hat, and has since become a colloquial way to advise someone to keep a secret or to discreetly manage information.
Exemplo
Before the surprise party, she asked everyone to keep it under their hat to ensure the birthday celebrant remained unaware.
The inventor shared a groundbreaking idea with a colleague, trusting them to keep it under their hat until the patent process was complete.
The detective shared crucial information with the witness, stressing the importance of keeping it under their hat to protect ongoing investigations.
