a thorn in one's side

/ə θɔrn ɪn wʌnz saɪd/◆idiom

persistent annoyance

My noisy neighbor is a thorn in my side.

The neighbor is a constant source of irritation.

◆ What It Really Means

A person or thing that causes persistent frustration or difficulty, often difficult to remove or resolve.

¶ Literal Meaning

A literal thorn embedded in someone's side, causing continuous pain.

Literal Breakdown

thorna sharp pointed projection on a plant+in one's sidelocated within the body's side region

◇ Mental Image

Imagine a thorn lodged in your side—small but constantly painful, hard to ignore or remove.

◈ When to Use

During a team project, a colleague keeps changing requirements at the last minute, making progress difficult. You might say, 'Their indecision is a thorn in our side.'

◉ Cultural Note

The phrase originates from biblical warnings about remaining enemies in Canaan (Numbers 33:55), symbolizing persistent irritation. It has been used in English literature since at least the 16th century.

informal

a person or thing that repeatedly causes trouble or annoyance

The outdated software has been a thorn in our side for years.

The software consistently causes problems.

Her critical comments were a thorn in his side during the project.

Her criticism constantly annoyed him.

Often used to describe something that is difficult to remove or ignore.

Collocations

constant thorn in one's sidea recurring source of irritationchronic thorn in one's sidea long-standing annoyance

Synonyms

nuisance irritant pest headache pain

Antonyms

blessing godsend benefit

Related Phrases

a pain in the neckidiom

an annoying person or thing

a fly in the ointmentidiom

a small but irritating flaw

rub someone the wrong wayphrasal verb

irritate or annoy someone

Pro Tip

Remembering the Idiom

Associate 'thorn' with a literal thorn—something small but constantly painful. This helps recall the figurative meaning of persistent annoyance.

Gold Rule

Usage Context

Use this idiom only for problems that are ongoing or recurring, not for one-time issues.

Word Origin

From the Bible (Numbers 33:55, Judges 2:3), where the Israelites were warned that remaining Canaanites would be 'thorns in your eyes and thorns in your sides.' The phrase evolved to symbolize persistent irritation.

Usage Notes

Commonly used in both personal and professional contexts to describe ongoing problems. Avoid using for minor or temporary annoyances.

Word Breakdown

thorn

a sharp, painful projection

noun

in one's side

located near or affecting someone

prepositional phrase

English Dictionary

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