fallen on

1.开始(行动);进攻,袭击

2.(节日)正当,适逢

3.忽然看出来,想起来

4.(灾难等)临头,落在...上

1.if something falls on someone, it is their responsibility to do it

2.to take hold of someone suddenly, either to attack them or to hug them

3.to start eating food or start using something as soon as it arrives, in a way that shows you want it very much