undertake /ˌʌndɚˈteɪk/ verb undertakes; undertook /-ˈtʊk/ ; /ˌʌndɚˈtʊk/; undertaken /-ˈteɪkən/ ; /ˌʌndɚˈteɪkən/; undertaking undertakes; undertook /-ˈtʊk/ ; /ˌʌndɚˈtʊk/; undertaken /-ˈteɪkən/ ; /ˌʌndɚˈteɪkən/; undertaking Learner's definition of UNDERTAKE
[+ object] formal
1
: to begin or attempt (something)开始；着手做；承担 -
undertake a task/journey承担任务；开始旅程
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He's undertaking a thorough search.他在进行彻底搜查。
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The researchers undertook a series of studies.研究人员进行了一系列的研究。
2
: to agree or promise to do (something)答应；承诺；同意 —
usually followed by to + verb通常接动词不定式