WordWeb Online

1. Enter upon an activity or enterprise
   - set about, attempt
    
2. Accept as a challenge
   "I'll undertake this difficult task";
   - tackle, take on
    
3. Promise to do or accomplish
   "undertake to free the prisoners";
   - guarantee
    
4. Enter into a contractual arrangement
   - contract
    
5. Accept as a charge
   - take in charge
    
6. (of a driver) overtake on the wrong side

Derived forms: undertakes, undertaken, undertaking, undertook

Type of: accept, assure, confront, consent, face, face up, go for, initiate, pioneer, promise