english
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general::
Phrase(s): (I) can’t say for sure. Inf. I do not know with any certainty. • Tom: When will the next train come through? Jane: I can’t say for sure. • Bob: How can the driver hit so many potholes? Bill: Can’t say for sure. I know he doesn’t see too well, though.
McGrawhill's American Idioms And Phrasal Verbs