be a recipe for disaster
US /bi ə ˈrɛs.ə.pi fɔr dɪˈzæs.tər/
UK /bi ə ˈrɛs.ə.pi fɔr dɪˈzæs.tər/

1.
to be very likely to have a bad result
:
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Mixing those two chemicals could be a recipe for disaster.
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Leaving the children unsupervised for so long is a recipe for disaster.