man's best friend
C1Semi-formal to informal, idiomatic.
Definition
Meaning
A dog; a domestic canine.
Any animal (typically a pet) regarded as a faithful, loyal, and cherished companion to humans. By extension, can refer to any person or thing considered a reliable and constant companion.
Linguistics
Semantic Notes
A fixed expression (cliché) that anthropomorphizes dogs. The possessive 'man's' is generic, referring to 'humankind', though modern usage sometimes substitutes 'human's' or 'person's'. Its use is often sentimental or rhetorical.
Dialectal Variation
British vs American Usage
Differences
None. The phrase is identical and equally common in both varieties.
Connotations
Sentimental, traditional, sometimes used ironically. No significant variation between UK and US.
Frequency
Equally frequent in both dialects; a common cultural trope.
Vocabulary
Collocations
Grammar
Valency Patterns
[Subject] is/are/be called man's best friend.The [noun] known as man's best friend.Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “A dog is a man's best friend.”
Usage
Context Usage
Business
Rare. Could be used in marketing for pet-related products.
Academic
Rare, except in cultural studies, sociology of pets, or historical linguistics.
Everyday
Common in conversation, writing about pets, and popular media.
Technical
Not used in scientific zoology; considered a folk term.
Examples
By Part of Speech
adjective
British English
- He has a real man's-best-friend relationship with his Labrador.
American English
- That man's-best-friend bond is unbreakable.
Examples
By CEFR Level
- A dog is man's best friend.
- My dog is truly man's best friend; he is always happy to see me.
- Often called man's best friend, the domestic dog has been by our side for millennia.
- The cliché of the dog as man's best friend obscures the complex, co-evolutionary history of our species.
Learning
Memory Aids
Mnemonic
Think of the three Fs: Faithful, Furry, Friend. The phrase has three words starting with 'm', 'b', 'f'.
Conceptual Metaphor
FRIENDSHIP IS LOYALTY / ANIMALS ARE COMPANIONS.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not translate literally as 'лучший друг человека' is the direct, correct equivalent, but it may sound overly literary. Avoid calquing the possessive structure incorrectly.
Common Mistakes
- Writing 'mans best friend' (missing apostrophe).
- Using 'men's best friend' (pluralized possessive).
- Applying it to inappropriate animals without established cultural context.
Practice
Quiz
What is the primary meaning of 'man's best friend'?
FAQ
Frequently Asked Questions
Not traditionally, but it is sometimes used humorously or affectionately for cats or other pets.
The phrase uses 'man' in the traditional, generic sense meaning 'humankind'. Modern alternatives like 'a person's best friend' are occasionally used.
No, it is semi-formal to informal and is considered a cliché. It is avoided in formal academic or technical writing.
The sentiment is ancient, but the specific phrase is often attributed to Frederick the Great of Prussia in the 18th century and was popularised later.