be certain that (something will happen or is the case)

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be certain that (something will happen or is the case)

To be absolutely sure or know definitively that something will happen or is the case. A: "Are you certain that Michael's coming?" B: "Yes, he called me this morning to confirm the time." I'm certain that the stove is off—I double-checked it myself.
See also: certain, happen, that, will
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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