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. Are you certain that the train leaves at 8:00?

See also: certain, happen, that, will

See also:

be certain
be certain of (something)
rule in
real McCoy
real McCoy, the
the real McCoy
the Big Easy
look for (someone or something) high and low
look for high and low
proof positive

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