undertakeun·der·take /ˌʌndəˈteɪk-ər-/ verb (past tensepst undertook /-ˈtʊk/, past participlepp undertaken /-ˈteɪkən/) [transitiveT]1to accept that you are responsible for a piece of work and start to do itHis first task was to undertake a major reorganization of production methods.
2undertake to do something to promise or agree to do somethingThe ferry operators undertook not to reduce services or increase fares.