for sure
for certain
Without doubt; certainly; surely.
He couldn't tell for sure from a distance whether it was George or Tom.
He didn't know for certain which bus to take.
I know for certain that he has a car.
In the dark, I couldn’t tell for sure whether it was Polly or Sarah who drove by.
I know for certain that Gene will move back to Washington next month.
Certain.
"That car is smashed so badly it's no good any more." "That's for sure!"