a monkey on somebody's back (American & Australian)
a serious problem that will not go away
The divorce proceedings are a monkey on her back.
a monkey on your back
a serious problem that you cannot forget
When you know you have to do everything perfectly, it puts a giant monkey on your back.
Usage notes: also used in the form get the monkey off your back (to end a problem): By winning the championship, this team has finally got the monkey off its back.
Linkback: https://tubagbohol.mikeligalig.com/index.php?topic=79146.0