become a thorn in (one's) side

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become a thorn in (one's) side

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' sides lately. This lawsuit has really become a thorn in my side. Let's just settle out of court.
See also: become, side, thorn
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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