student asking question

What's "heat up" mean?

teacher

Native speaker’s answer

Rebecca

To "heat up" something means to cause something to turn warm or hot, by giving it heat (like a fire or something else). In this case, the speaker is using the campfire to heat up the soup (make it hot). Ex: Can you heat up some food in the microwave? Ex: The food is cold already, even though I heated it up not long ago.

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