a curve ball

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a curve ball

1. In baseball, a ball that curves in its trajectory toward home plate. He's a good batter, but he has a hard time hitting a curve ball.
2. An unexpected occurrence or thing. I thought I had confirmed my hypothesis, so these results are a real curve ball.
3. A deceptive action or thing. I don't know, I think her sudden displays of affection are just a curve ball to get me to trust her.
See also: ball, curve