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English definition of “undertake”

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undertake

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