Meaning of “burn out” - Learner’s Dictionary

burn out

phrasal verb with burn uk us /bɜːn/ verb (past tense and past participle burnt, burned)

B2 to become sick or very tired from working too hard:

If Olivia keeps working late every night, she will burn out.

(Definition of “burn out phrasal verb, verb” from the Cambridge Learner’s Dictionary © Cambridge University Press)