fall on somebody

Từ điển Oxford Advanced Learner 8th

ˈfall on/upon sb/sth derived
no passive (especially BrE)
1. to attack or take hold of sb/sth with a lot of energy and enthusiasm
•They fell on him with sticks.
•The children fell on the food and ate it greedily.
2. to be the responsibility of sb
•The full cost of the wedding fell on us.
Main entry: ↑fall_derived