burden
US /ˈbɝː.dən/
UK /ˈbɝː.dən/

1.
a heavy load, especially one that is to be carried
:
•
He carried the heavy burden on his back.
•
The donkey was loaded with a large burden of firewood.
2.
a duty or responsibility that is difficult to bear
:
•
The financial burden of caring for her elderly parents was immense.
•
He felt the burden of leadership on his shoulders.
1.
to load heavily
:
•
Don't burden yourself with too many tasks.
•
The new regulations will burden small businesses.