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To know something `offhand`: without having to refer to a source.
PersonA: Hey, do you by chance know offhand who's going to be teaching physics this semester?
PersonB: No sorry, I didn't check.
by L e a f January 17, 2010
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Offhand was a family of axe killers no one ever caught.
Don't cross the offhands
by James offhand smitty June 25, 2018
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