Meaning of “undertake” - Learner’s Dictionary

undertake

verb uk us /ˌʌndəˈteɪk/ (past tense undertook, past participle undertaken) formal

[ T ] to start work on something that will take a long time or be difficult:

Max has undertaken the task of restoring an old houseboat.
undertake to do sth

to promise to do something

(Definition of “undertake” from the Cambridge Learner’s Dictionary © Cambridge University Press)