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?