To bring a liquid to the temperature at which it bubbles and turns to vapor.

To heat something again to reach boiling point.

दोबारा उबालना

English Usage: After preparing the soup, I had to re-boil it to warm it up.

Hindi Usage: सूप बनाने के बाद, मुझे इसे गर्म करने के लिए दोबारा उबालना पड़ा।