Idiom Breakdown

keep a lid on

IMPERATIVE

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Definition

To keep something secret.

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"It's supposed to be a surprise, so try to keep a lid on it, will you?"
"If he was listening to the England fans who gathered and sang non-stop late into the Moscow night behind the goal in the Spartak Stadium, it may have dawned on him that keeping a lid on expectations is likely to be a losing battle."

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