Please button your lip until the surprise party begins.
button one's lip
idiomTo remain silent, especially in order to keep a secret or to avoid saying something inappropriate.
He had to button his lip during the meeting to avoid revealing the company's secret plans.
Although he desperately wanted to voice his disagreement, he chose to button his lip, fearing that speaking out would jeopardize his position in the firm.
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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.
- 04
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.