thorn

US /θɔːrn/
UK /θɔːrn/
"thorn" picture
1.

a stiff, sharp point on the stem of a plant

:
Be careful not to prick your finger on a thorn.
The rose bush was full of sharp thorns.
2.

a source of distress or annoyance

:
His constant complaining was a thorn in my side.
The unresolved issue remained a thorn for the team.