To do something that can cause you trouble.
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To take a serious risk by doing something that could lead to very bad consequences.
When you play with fire, you are involved in a dangerous or reckless situation where the outcome could harm you badly.
It is often used as a warning when someone is making a risky choice carelessly.
"On Thin Ice"
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In a fragile situation where one mistake could cause serious trouble
"Push Your Luck"
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To continue taking risks after already being fortunate
"Play with Fire"
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To take a dangerous risk that could lead to serious harm