The idiom "a thorn in one's side" describes a persistent source of annoyance, irritation, or trouble. It refers to something or someone that constantly causes problems or difficulties for another person or entity.
The expression originates from biblical references, specifically the Old Testament (Numbers 33:55 and Joshua 23:13), where God warns that if the Israelites do not drive out the inhabitants of the land, those inhabitants will become "thorns in your sides" and "pricks in your eyes," meaning they will be a constant source of trouble and conflict.
The register is neutral; it can be used in both formal and informal contexts.
"A thorn in one's side" is a relatively fixed idiomatic expression. It can be modified with adjectives to further describe the nature of the annoyance (e.g., "a constant thorn in my side"). The possessive pronoun must agree with who is being annoyed (e.g., "a thorn in her side"). It can be used in negative constructions, such as "not a thorn in his side." It can also appear in questions, such as "Is he a thorn in your side?"
It sounds unnatural to use it too literally (e.g., describing an actual physical thorn). Replacing "thorn" with a near synonym (e.g., "prickle") destroys the idiomatic meaning.
These examples are sourced from a thorn in one's side on Ludwig.guru.
"It's always a thorn in one's side to know that someone else is missing it," she said. — nytimes.com
"Joice Mujuru remains a thorn in Robert Mugabe's side." — theguardian.com
"There remains, however, a thorn in Facebook's side: Snapchat." — theguardian.com
"Kilmarnock improved after the break, with substitute Boyd proving a thorn in Aberdeen's side." — bbc.com
"Human Rights Watch is a constant thorn in Kagame's side." — theguardian.com
Examples sourced from https://ludwig.guru/s/a+thorn+in+one's+side
| Phrase | Context |
|---|---|
| pain in the neck | Informal; describes something very annoying. |
| headache | Informal; describes a problem that causes stress. |
| nuisance | More formal; describes something that causes inconvenience. |
| annoyance | General term for something irritating. |
| source of irritation | More formal and descriptive. |
| bête noire | French term meaning "black beast"; refers to something particularly disliked or feared. |
| aggravation | Implies something that intensifies frustration. |
Common errors include:
| Expression | Idiomatic Meaning | Register | Avoid In |
|---|---|---|---|
| a thorn in one's side | A persistent source of annoyance or trouble | Neutral | Literal contexts; when describing a positive thing |
No, the expression "a thorn in one's side" is almost always used figuratively. It refers to a person, thing, or situation that is a constant source of annoyance or trouble, not an actual physical thorn.
Both phrases describe something annoying, but "a thorn in one's side" suggests a more persistent and ongoing problem, whereas "a pain in the neck" can refer to a more temporary or minor annoyance. A "thorn in one's side" is often a more significant and enduring source of irritation.
A frequent error is interpreting the expression literally or using the wrong possessive pronoun. Remember that it's a figurative expression meaning something is persistently annoying, and the possessive pronoun (e.g., my, your, his, her) must correctly refer to whose side the thorn is in.
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