a thorn in one's side

/ə θɔrn ɪn wʌnz saɪd/

noun phrase★Intermediate— persistent annoyance◆idiom

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The outdated software has been a thorn in our side for years.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