The character in the movie decides to eat his gun.
eat one's gun
idiomTo commit suicide, especially by use of a firearm discharged into the victim's mouth.
The detective found a note left by the man who chose to eat his gun in the study.
Faced with the total collapse of his reputation and impending imprisonment, the disgraced official chose to eat his gun rather than endure a public trial.
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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.