You should hold your jaw during the exam.
hold one's jaw
idiomTo refrain from talking, to hold one's tongue, to be quiet.
The manager told the team to hold their jaw while the director explained the new policy.
Despite his intense desire to challenge the speaker's false claims, he chose to hold his jaw to maintain the professional decorum of the meeting.
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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.
- 03
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”).
- 05
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.