Webster's English Dictionary

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undertake

un.der.take \.*n-d*r-'ta-k\ vt 1: to take in hand : enter upon : set about 
   : ATTEMPT  2: to put oneself under obligation to perform : CONTRACT, COVEN 
   ANT 3: GUARANTEE, PROMISE  4: to accept as a charge  archaic  : to give 
   surety or assume responsibility