Rewarm (verb)

1. To warm something again, to heat up something that has cooled down.
2. To restore warmth to something or someone.

Origin:

Early 19th century: from re- "again" + warm.

Examples:

1. She rewarmed the leftovers in the microwave before serving.
2. I had to rewarm my hands by the fire after being outside in the cold.
3. The doctor rewarmed the baby with a heating blanket.
4. I rewarmed my coffee before drinking it.
5. They had to rewarm the patient before they could operate on him.