throw a curve

throw (someone) a curve (ball) (American & Australian, informal)

to surprise someone with something that is difficult or unpleasant to deal with. The weather threw a curve at their barbecue and they had to eat indoors.

See also: throw

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throw someone a curve

to surprise someone with a problem or something unexpected. Bill threw me a curve by asking me to go to the theater with him instead of a hockey game.

Usage notes: also used in the form throw someone a curveball

Etymology: from the curve in baseball (= a type of throw to the person at bat that does not travel in a direct route )

See also: throw