Definition of 勝ち逃げ
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(n) quitting while one is ahead
「あの、かりんさん・・・、そろそろお開きにしませんか?」「駄目、勝ち逃げ禁止!今度こそボクが勝つの!」
"Er, Karin ..., shouldn't we call it a night soon?" "No! No quitting while ahead! Next time I'll win for sure!"