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Definitely. A: "How many people are coming to dinner tonight?" B: "I can't say for sure—my family tends to just show up without responding to invitations." Oh, I'll be there, for sure—I'm just running a little late.
for certain. I will be there for sure. Sally: Are you ready to go? Bob: For sure. Sally: Then, let's go.
for ˈsure(informal) definitely: ‘What time will you be here?’ ‘I don’t know for sure yet.’ ♢ I’ll be there for sure; don’t worry.
phr. absolutely. (The same as fer shur.) I’ll be there, for sure.
Certainly; unquestionably: We'll win for sure.