vt. (-took; -taken ) 1.承担；承办；答应，约定 (to do sth.)。 2.担保，保证 (that)。 3. 断言 (that)。 4.着手，从事。 5.〔古语〕向…挑战。 短语和例子 He undertook to be here at ten o'clock. 他答应十点钟到这儿来。 Undertake a dangerous task 承担一件危险任务。 vi. 1.〔古语〕担保，保证，负责，做证人 (for)；应承，约定。 2.〔口语〕承办丧事。 短语和例子 He undertook for her security. 他保证她的安全。
enter into a contractual arrangement 同义词：contract,
promise to do or accomplish; "guarantee to free the prisoners" 同义词：guarantee,
enter upon an activity or enterprise 同义词：set about, attempt,
accept as a charge 同义词：take in charge,
accept as a challenge; "I''ll tackle this difficult task" 同义词：tackle, take on,
例句与用法
1.
He made no attempt to carry out his undertaking . 他无意实现他的诺言。
2.
They undertook to promote exchanges and trade . 他们同意促进交流和贸易。
3.
He undertook to be here at ten o’clock . 他答应十点钟到这儿来。
4.
He lent his name to the undertaking . 他以自己的名义支持该事业。
5.
I've already undertaken several moves . 我已经采取了几项措施。
6.
Marriage is not something to be undertaken lightly . 婚姻大事不可掉以轻心。
7.
The prime minister had obtained the royal undertaking . 首相得到国王的许诺。
8.
If you will undertake the affair , i shall be very grateful . 我将不胜感激。
9.
The advocate has undertaken my case . 律师己接受我的案子。
10.
Two couples undertake a leisure activity together . 两对男女一同参加娱乐活动。
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