in for

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Guaranteed to get or have, as in We're in for a difficult time. [ Late 1500s ]
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in for it. Certain to encounter trouble or punishment, as in When Harry finds out we left early, we'll be in for it. [ Late 1600s ]
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Involved or entered for some purpose, as in We're in for the profits. [ Mid-1800s ]
Also see: in for a penny