arnold

arnold — noun

1. a person who betrays their country or group, named after Benedict Arnold (1741–1

1.nounB2
Definition

a person who betrays their country or group, named after Benedict Arnold (1741–1801), an American general who fought for independence but later secretly helped the British army during the American Revolution.

Example

Ms. Chen explained how Arnold's 1780 plot to surrender West Point made his name a lasting symbol of betrayal.

proper noun as cultural symbol of betrayal

When the journalist leaked secret documents to a foreign government, critics called him a modern-day Benedict Arnold.

used as common noun: 'a Benedict Arnold'

Common collocations
  • Benedict Arnold
  • call someone a Benedict Arnold
  • modern-day Benedict Arnold
Synonyms
  • traitor

    direct synonym; 'traitor' is the general term, while 'Benedict Arnold' is a specific cultural reference

  • turncoat

    informal term for someone who switches sides, less specific than 'Benedict Arnold'

Antonyms
  • patriot

    a person who supports their country, opposite of a traitor

Grammar Patterns

proper noun used as a common noun for 'traitor'

Usage Note

In everyday American English, 'Benedict Arnold' is sometimes used as a common noun meaning 'a person who betrays a trust or a group.' The first name 'Benedict' is often included even when referring to another traitor.

Common Mistakes

Arnold was a spy for the British.
Benedict Arnold was a spy for the British.
In formal historical references, the full name is preferred.

2. Henry Harley 'Hap' Arnold (1886–1950), the only United States military officer e

2.nounC1
Definition

Henry Harley 'Hap' Arnold (1886–1950), the only United States military officer ever to hold the rank of General of the Air Force, who commanded the U.S. Army Air Forces during World War II and helped create the independent U.S. Air Force after the war.

Example

Hap Arnold oversaw the U.S. Army Air Forces' expansion from 20,000 men in 1939 to two million by 1945.

collocation: oversaw the growth of

In 1948, the base in Tennessee was renamed Arnold Air Force Base in honor of General Hap Arnold.

Common collocations
  • General Hap Arnold
  • General of the Air Force
  • Arnold Air Force Base

Grammar Patterns

proper noun referring to a historical military figure

Usage Note

Commonly referred to as 'Hap Arnold' or 'General Arnold.' His official rank 'General of the Air Force' is equivalent to a five-star general and has only been held by one person.

3. Matthew Arnold (1822–1888), an English poet and cultural critic of the Victorian

3.nounC1
Definition

Matthew Arnold (1822–1888), an English poet and cultural critic of the Victorian period, best remembered for poems such as 'Dover Beach' and for his influential essays on literature, education, and society.

Example

Hari chose Matthew Arnold's poem 'Dover Beach' for his literature presentation because of its powerful sea imagery.

In his 1869 book 'Culture and Anarchy,' Matthew Arnold argued that poetry should offer comfort in an age of religious doubt.

grammar: argued that + should

Common collocations
  • poems by Matthew Arnold
  • Arnold's essays on culture
  • Matthew Arnold's 'Dover Beach'

Grammar Patterns

proper noun referring to a literary figure

Usage Note

Matthew Arnold is also known for his role as an education inspector and his critical work 'Culture and Anarchy.' In literary contexts, 'Arnold' almost always refers to Matthew Arnold, not Thomas or Benedict.

Common Mistakes

Matthew Arnold was a poet during the Renaissance.
Matthew Arnold was a poet during the Victorian period.
His active years were in the mid-to-late 1800s.

4. Thomas Arnold (1795–1842), an English historian and headmaster of Rugby School w

4.nounC1
Definition

Thomas Arnold (1795–1842), an English historian and headmaster of Rugby School who introduced wide-ranging reforms to the British public school system, emphasizing moral development, sports, and academic discipline.

Example

As headmaster of Rugby School from 1828, Thomas Arnold believed developing a student's character was a school's highest goal.

grammar: believe that + should + verb

The reforms introduced by Dr. Arnold at Rugby School influenced education across England for generations.

Common collocations
  • Dr. Thomas Arnold
  • headmaster of Rugby School
  • Arnold's educational reforms

Grammar Patterns

proper noun referring to a historical educator

Usage Note

Best known as the headmaster of Rugby School and the father of poet Matthew Arnold. Not to be confused with his son, who is better known in literary circles.

Synonym discussion

Sense: noun/1

All four words describe someone who betrays a group or country, but they differ in register and specificity. 'Traitor' is the most general and widely used term; it appears in legal contexts (treason) as well as everyday speech. 'Turncoat' is informal and suggests a person who switches political parties or sides for personal gain; it is rarely used in formal historical writing. 'Defector' is more neutral and refers specifically to someone who leaves their country or group to join the opposing side, often for ideological reasons — a Cold War defector from the Soviet Union. 'Quisling' is a proper noun turned common noun, referring specifically to a puppet leader who collaborates with an occupying enemy force, named after Norwegian leader Vidkun Quisling. 'Benedict Arnold' differs from all of these because it carries a distinctly American historical and cultural weight; calling someone a 'Benedict Arnold' implies not just betrayal but also the idea that the person was once a trusted insider who turned against their own side. For example, one might say: 'The senator was called a Benedict Arnold after he voted against his own party's bill.'

traitorturncoatdefectorquisling

Common collocations

Nouns

  • name Arnold
  • the Arnold family

Phrases

  • the name Arnold is synonymous with
  • the Arnold of the modern era

Etymology

Old GermanicNorman FrenchEnglish

The name 'Arnold' comes from Old Germanic elements 'arn' (eagle) and 'wald' (power, ruler), meaning 'eagle ruler.' It was brought to England by the Normans after the 1066 conquest and has been used as both a given name and a surname. Over time, different historical figures named Arnold — including Benedict, Thomas, Matthew, and Hap — became prominent in different fields, turning 'Arnold' into a surname with strong historical associations in America and Britain.