for certain
Definitely. A: "How many people are coming to dinner tonight?" B: "I can't say for certain—my family tends to just show up without responding to invitations."
for certain
Also, for sure. Without doubt. For example, I can't tell for certain if this is the right color, or I know for sure that she has a new car. The first term dates from the early 1300s. The variant, dating from the late 1500s, is also used colloquially to express agreement or assert the truth of a statement, as in Mary is really bossy.-That's for sure, or Are you coming to the party?-For sure I am.
for ˈcertain
without doubt: No one can say for certain how the world’s climate is likely to change. for certain
Without doubt; definitely.