blow someone's brains out
US /bloʊ ˈsʌm.wʌnz breɪnz aʊt/
UK /bloʊ ˈsʌm.wʌnz breɪnz aʊt/

1.
誰かの脳みそを吹き飛ばす, 頭を撃ち抜いて殺す
to kill someone by shooting them in the head
:
•
He threatened to blow someone's brains out if they didn't comply.
彼は従わないなら誰かの脳みそを吹き飛ばすと脅した。
•
The villain swore he would blow someone's brains out if his demands weren't met.
悪役は、要求が満たされなければ誰かの脳みそを吹き飛ばすと誓った。