fall on
US /fɔːl ɑːn/
UK /fɔːl ɑːn/

1.
to attack someone or something suddenly and aggressively
:
•
The wolves fell on the deer.
•
The angry crowd fell on the protestors.
2.
to be the responsibility of someone
:
•
The task of organizing the event fell on her.
•
The blame for the mistake fell on the new employee.
3.
to coincide with a particular date or day
:
•
This year, Christmas falls on a Tuesday.
•
Her birthday falls on the same day as mine.