He laughed in his sleeve when his rival made a mistake.
laugh in one's sleeve
idiomto laugh in secret or to oneself, usually gloatingly
While the boss complained about the budget, the manager laughed in his sleeve because he knew the project was already finished.
Observing the arrogant politician struggle with his own contradictory policy, the journalist could only laugh in his sleeve at the irony of the situation.
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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.