She knits her brows when she is confused.
knit one's brows
idiomTo scowl, indicating anger, worry, or puzzlement.
The student knitted his brows as he tried to solve the difficult math problem.
As the detective reviewed the contradictory evidence, he knitted his brows in deep concentration, sensing that something about the case was not quite right.
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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.