be 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.
- certain
- be certain of (something)
- certain sure
- go on the prowl
- treat (someone or something) like (someone or something else)
- treat like
- under certain circumstances
- (somewhere or something) or bust
- or bust
- be a dead cert