Usage Note
Wärmen in health contexts means to apply heat for relief — a heat pad for muscle pain, warming cold hands. Used reflexively: sich wärmen = to warm oneself. Contrast aufwärmen (specifically pre-exercise warm-up).
Examples
"Eine Wärmflasche wärmt die verspannten Rückenmuskeln."
Natural Translation
A hot water bottle warms the tense back muscles.
Literal Translation
A warm bottle warms the tensed back muscles.

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