The Oxford Thesaurus An A-Z Dictionary of Synonyms - undertake v.

1) assume, take on or upon (oneself) , accept, take or assume or bear the responsibility for, enter upon, begin, start, set about, embark on, tackle, try, attempt: Gates might be undertaking a bit too much, considering his condition. 2) promise, covenant, agree, contract, pledge, vow, swear, warrant, guarantee, bargain, commit (oneself) , stipulate, engage: Is it not true that you undertook to complete the work in six months?