Pronunciation: (un"dur-tāk'), [key]
—v., -took, -tak•en, -tak•ing.
1. to take upon oneself, as a task, performance, etc.; attempt: She undertook the job of answering all the mail.
2. to promise, agree, or obligate oneself (fol. by an infinitive): The married couple undertook to love, honor, and cherish each other.
3. to warrant or guarantee (fol. by a clause): The sponsors undertake that their candidate meets all the requirements.
4. to take in charge; assume the duty of attending to: The lawyer undertook a new case.
Archaic.to engage oneself by promise; give a guarantee, or become surety.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.