Usage Note
umknicken specifically refers to the ankle folding outward unexpectedly — very common in everyday speech. It is intransitive here, often mit dem Fuß umknicken; in the perfect it takes sein (ich bin umgeknickt).
Examples
"Sie knickte auf dem Pflaster um und verdrehte den Knöchel."
Natural Translation
She rolled her foot on the cobblestones and hurt her ankle.
Literal Translation
She twisted on the cobblestones and twisted the ankle.

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