burn up

From burn +‎ up. Compare Middle English upbrennynge, upbrennende (“burning up”, present participle), German Low German upbrannen (“to burn up”).

burn up (third-person singular simple present burns up, present participle burning up, simple past and past participle burned up or burnt up)

1. (intransitive) To catch fire and burn until destroyed.

   The rocket may burn up on reentry.

2. (transitive) To destroy by burning.
3. (transitive) To anger; to annoy.

   His thoughtlessness really burns me up.

4. (intransitive) To feel overly hot or inflamed.
   1. (intransitive, specifically) To experience a high fever.
5. (dated) To ride a motorcycle or other vehicle at high speed.

burn up (plural burn ups)

1. Misspelling of burnup.