definitely or positively (`sure' is sometimes used informally for `surely')
"the results are surely encouraging"
"she certainly is a hard worker"
"it's going to be a good day for sure"
"they are coming, for certain"
"they thought he had been killed sure enough"
"he'll win sure as shooting"
"they sure smell good"
"sure he'll come"
- for sure - for certain - sure enough - sure as shooting