for sure

for sure or for certain  {adv. phr.}
1. 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.
2.  {slang}
Certain.
"That car is smashed so badly it's no good any more." "That's for sure!" Compare: SURE THING.
Categories: doubt {adv. phr.} {slang}