blow someone's brains out
US /bloʊ ˈsʌm.wʌnz breɪnz aʊt/
UK /bloʊ ˈsʌm.wʌnz breɪnz aʊt/
1.
to kill someone by shooting them in the head
:
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He threatened to blow someone's brains out if they didn't comply.
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The villain swore he would blow someone's brains out if his demands weren't met.