take something on        
phrasal verb with take verb uk/teɪk/ us/teɪk/ took | taken
C1 接受(工作);承担(责任)
to accept a particular job or responsibility
  She took too much on and made herself ill. 她承担的任务太重,结果病倒了。 
 - More examples
 - She has taken on far too much work.
 - You can't take on responsibility for the whole event.