1. phrasal verbIf a fire burns itself out, it stops burning because there is nothing left to burn.
Fire officials let the fire burn itself out. [VERB pronoun-reflexive PARTICLE]
2. phrasal verbIf you burn yourself out, you make yourself exhausted or ill by working too hard.
He might burn himself out and go to an early grave. [VERB pronoun-reflexive PARTICLE]
3. See also burnout, burnt-out
See full dictionary entry for burn