Also means
to clench
Usage Note
krampfen describes a muscle cramping involuntarily. Often used reflexively (sich krampfen) for a muscle seizing up. Learners encounter it in sports, medical, and pain-description contexts. Distinct from verkrampfen, which implies chronic tension.
Examples
"Beim Schwimmen krampfte plötzlich sein linkes Bein."
Natural Translation
While swimming his left leg suddenly cramped up.
Literal Translation
At the swimming cramped suddenly his left leg.

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