push your luck
US /pʊʃ jʊər lʌk/
UK /pʊʃ jʊər lʌk/

1.
運を試す, 調子に乗る
to try to get more than what you have or are offered, with the risk of losing everything
:
•
You've already won a small prize; don't push your luck by playing again.
もう小さな賞品を獲得したんだから、もう一度プレイして運を試すな。
•
I think I'll stop now, I don't want to push my luck.
もうやめておこう、運を試すのはやめたい。