thorn in your side
US /θɔrn ɪn jʊər saɪd/
UK /θɔrn ɪn jʊər saɪd/

1.
duri dalam daging, sumber masalah
a person or thing that repeatedly causes trouble or annoyance
:
•
His younger brother has always been a thorn in his side, constantly getting into mischief.
Adik laki-lakinya selalu menjadi duri dalam dagingnya, terus-menerus membuat masalah.
•
The new policy has become a real thorn in the side of many employees.
Kebijakan baru itu telah menjadi duri dalam daging bagi banyak karyawan.