Usage Note
anschwellen is separable and describes a body part swelling — from injury, inflammation, or allergy. Der Knöchel schwillt an (the ankle is swelling). Very common in medical and first-aid contexts. Distinguish from anwachsen (to grow onto).
Examples
"Nach dem Umknicken schwoll sein Knöchel sofort an."
Natural Translation
After the sprain his ankle swelled up immediately.
Literal Translation
After the rolling-over his ankle swelled immediately up.

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