v. un·der·took (-tk), un·der·tak·en, un·der·tak·ing, un·der·takes
1. To deliberately begin to do (something): undertake a task.
2. To pledge or commit oneself (to do something): undertake to care for an elderly relative.
3. To promise or guarantee: "The man undertook that one room at least should be ready for occupation the next day" (Thomas Hardy).
To make oneself responsible. Used with for.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.