Please keep your mouth shut about the surprise party.
keep one's mouth shut
idiomTo keep a secret; to refrain from speaking indiscreetly or carelessly; broadly, to refrain from speaking altogether.
The boss told me the news early, but I had to keep my mouth shut until the official announcement.
Despite the intense pressure from the investigators to reveal his accomplice, he chose to keep his mouth shut and face the consequences alone.
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abound in one's own sense
To follow one’s own inclinations and opinions.
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ace up one's sleeve
A surprise advantage of which others are not aware.
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act one's age
To behave in a manner appropriate to one's age.
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act one's age, not one's shoe size
Synonym of act one's age (“to behave in a mature manner; to avoid being childish”).
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afraid of one's own shadow
Exceptionally timid.
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air one's dirty laundry in public
To reveal one's sordid secrets to the public.
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air one's dirty linen in public
Synonym of air one's dirty laundry in public.
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albatross around one's neck
A characteristic, possession, associate, or previous deed that hinders one's ability to succeed.