Undertake v. t. : To take upon one's self; to engage in; to enter upon; to take in hand; to begin to perform; to set about; to attempt.

Undertake v. t. : Specifically, to take upon one's self solemnly or expressly; to lay one's self under obligation, or to enter into stipulations, to perform or to execute; to covenant; to contract.

Undertake v. t. : Hence, to guarantee; to promise; to affirm.

Undertake v. t. : To assume, as a character.

Undertake v. t. : To engage with; to attack.

Undertake v. t. : To have knowledge of; to hear.

Undertake v. t. : To take or have the charge of.

Undertake v. i. : To take upon one's self, or assume, any business, duty, or province.

Undertake v. i. : To venture; to hazard.

Undertake v. i. : To give a promise or guarantee; to be surety.

Example:
What kind of tests girls Undertake before selecting a long-term boyfriend?

Taxonomy
Merriam-Webster Online Dictionary, Dictionary, webster, tak, Word Games, Webster Online Dictionary with audio pronunciations, Custom Search, glossary, english, language, ESL, Search, n-d, tāk, Inflected, 14th century, transitive verb, learn to swim.

Defination from the web:
undertake from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... 3 : guarantee, promise <readily undertook that the letter should be securely conveyed — Sir Walter Scott>intransitive verb archaic : to give ...