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3. thorn in side

thorn in side

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*thorn in someone's side

 and *thorn in someone's flesh

Fig. a constant bother or annoyance to someone. (*Typically: be ~; become ~.) This problem is a thorn in my side. I wish I had a solution for it. John was a thorn in my flesh for years before I finally got rid of him.

See also: side, thorn