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English definition of “undertake”

undertake

verb     /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.Taking part and getting involvedGetting involved for one's own benefit or against others' will
undertake to do sth to promise to do somethingMaking and breaking promises and commitmentsTaking part and getting involvedGetting involved for one's own benefit or against others' will
(Definition of undertake verb from the Cambridge Learner's Dictionary © Cambridge University Press)

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