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be (walking) on thin ice

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be (walking) on thin ice

To be doing something very risky or dangerous that could result in imminent disaster or ruin. I hope you realize that you'll be on thin ice if you decide to gamble your employees' retirement funds on such a dodgy investment. You're walking on thin ice by continuing to come in late. If the boss notices, you'll be fired.

See also: ice, on, thin