mum's the word

Meaning: Keep this secret; say nothing.

Language: English

Literally: (Already vivid in English)

Example: “We're planning a surprise party, so mum's the word.”

Category: Daily Life

Origin: "Mum" imitates the sound made with closed lips. It is found in Shakespeare's Henry VI, Part 2 (around 1591): "Seal up your lips and give no words but mum."

Equivalents in other languages

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