be certain

(redirected from am certain)

be certain

To be sure (about something); to know definitively (that something will happen or is the case). A: "Yes, Michael's coming tonight." B: "Are you certain? It's already past seven, and he's not here yet." I'm certain that the stove is off—I double-checked it myself.
See also: certain
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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