undertake

[1]	assume , set about , attempt , take on/upon (oneself) , accept , take/assume/bear the responsibility for , enter upon , begin , start , set about , embark on , tackle , try , attempt
[2]	promise , tackle , take on , covenant , agree , contract , pledge , vow , swear , warrant , guarantee , bargain , commit (oneself) , stipulate , engage
[3]	guarantee
[4]	contract
[5]	take in charge