become a thorn in (one's) flesh

become a thorn in (one's) flesh

To become a constant or persistent cause of annoyance, frustration, or trouble. My professor was always a passionate environmental activist. Apparently, he's become quite a thorn in the oil companies' flesh lately. This lawsuit has really become a thorn in my flesh. Let's just settle out of court. My car has become such a thorn in my flesh—today is the third day this week that it wouldn't start for me!

See also: become, flesh, thorn

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