also: からすなめり · からすなえり
noun
calf cramp; charley horse
Medical term for a sudden, painful muscle cramp in the calf. The common colloquial term is こむら返り.
See also: こむら返り
夜中に転筋が起きて飛び起きた。
I woke up with a start when I got a calf cramp in the middle of the night.
運動不足だと転筋を起こしやすい。
If you don't exercise enough, you're prone to getting calf cramps.
Common everyday word for calf cramp. 転筋 is the formal medical term.
From 転 (turning, sudden change) and 筋 (muscle), referring to a sudden muscle spasm. The readings からすなめり and からすなえり are of uncertain origin, possibly dialectal or archaic.