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push (one's) luck
To risk losing the good favor or fortune one has garnered thus far by brashly or overconfidently seeking more. I know you're in the boss's good graces now, but don't push your luck. She's been known to turn on people for getting too cocky. I've had some good winnings at blackjack, but I don't think I should push my luck any further.
push one's luckand press one's luck
to expect continued good fortune; to expect to continue to escape bad luck. (Often implies unreasonable expectation.) You're okay so far, but don't push your luck. Bob pressed his luck too much and got into a lot of trouble.