Charley horse? What does it mean?

[Saneta]

English Language Tests, Intermediate level

ESL/EFL Test #282 "English Slang Idioms (4)", question 10

Serena had to stop swimming. The ......... horse in her leg was too painful to keep going.

(a) quarter
(b) miniature
(c) crazy
(d) charley

English Language Tests, Intermediate level

ESL/EFL Test #282 "English Slang Idioms (4)", answer 10

Serena had to stop swimming. The charley horse in her leg was too painful to keep going.

Correct answer: (d) charley
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charley horse? what does it mean? thanks

[Linda]

Hi Saneta,
Charley horse: "a leg cramp or stiffness in the leg that is painful."
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