Meaning of “undertake” in the English Dictionary

"undertake" in British English

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undertakeverb [ T ]

uk /ˌʌn.dəˈteɪk/ us /ˌʌn.dɚˈteɪk/ undertook, undertaken

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

"undertake" in American English

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undertakeverb

us /ˌʌn·dərˈteɪk/ past tense undertook /ˌʌn·dərˈtʊk/ , past participle undertaken /ˌʌn·dərˈteɪ·kən/

to take responsibility for and begin doing something:

[ T ] The president directed the Department of Justice to undertake an investigation of the allegations.
[ + to infinitive ] I undertook to help him learn English.

(Definition of “undertake” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"undertake" in Business English

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undertakeverb

uk /ˌʌndəˈteɪk/ us undertook, undertaken

[ T ] to do or begin to do something, especially something that will take a long time or be difficult:

He needs to undertake a proper cashflow and budgeting exercise.
Some companies have undertaken a thorough transformation of their production methods.

[ I ] formal to promise or agree that you will do something:

undertake to do sth All banks have undertaken to give printouts on request of standing orders and direct debits.

(Definition of “undertake” from the Cambridge Business English Dictionary © Cambridge University Press)