quack

IPA/kwæk/
KK[kwˈæk]IPA/kwæk/

quack — noun

  • quacksingular
  • quacksplural

1. a fake doctor — someone with no real medical training who tricks sick people int

1.nounC1
Definition

a fake doctor — someone with no real medical training who tricks sick people into paying for treatments that do not work, and may even harm them.

Example

The court fined the quack who sold sugar pills as a cancer cure to dying patients.

the quack who + relative clause

Reema's grandmother spent her savings on potions from a quack who promised to cure her arthritis.

potions/treatments from a quack

Common collocations
  • quack doctor
  • quack remedy
  • quack cure
  • expose a quack
Synonyms
  • charlatan

    more formal; covers any field, not just medicine

  • fraud

    general word for any deceiver; less specific to medicine

  • impostor

    stresses pretending to be someone or something they're not

Grammar Patterns

a/the quack

quack + noun (remedy, cure)

Usage Note

Strongly negative and accusatory; only used when the speaker believes the person is genuinely fraudulent or dangerously unqualified. Often modifies another medical noun, as in 'quack doctor', 'quack remedy', or 'quack cure'.

Common Mistakes

My doctor is a quack because she gave me the wrong pills.
My doctor made a mistake with my prescription.
'quack' means deliberately fake or untrained, not just careless or wrong.

2. a casual, slightly humorous British word for any doctor, used between friends or

2.nounC2
Definition

a casual, slightly humorous British word for any doctor, used between friends or family without implying the doctor is fake.

Example

Dario's father told him to see the quack about his sore knee before the football match.

see the quack about + symptom

I'll pop down to the quack on Friday to get my flu jab.

informal British: pop down to the quack

Common collocations
  • see the quack
  • go to the quack
  • ring the quack
Synonyms
  • doc

    similarly informal; common in both British and American English

  • GP

    neutral British term for a family doctor; not jokey

Grammar Patterns

see/go to the quack

Usage Note

Distinguish from sense 1: here 'the quack' is jokey shorthand for one's own real doctor, like calling a teacher 'the boss'. Mainly British, especially older speakers. Tone is friendly, not accusing.

Common Mistakes

I made an appointment with a quack to discuss my treatment.' (in a formal email)
I made an appointment with my doctor to discuss my treatment.
sense 2 is casual spoken English; in writing or formal speech a reader will assume sense 1 (fake doctor).

3. the short, loud noise produced by a duck, usually repeated several times in a ro

3.nounB1
Definition

the short, loud noise produced by a duck, usually repeated several times in a row.

Example

Léa heard a single loud quack from the reeds and knew the ducklings had returned to the pond.

a single loud quack from + place

The cheerful quacks of the ducks woke Min before her alarm clock rang.

the quacks of + duck noun

Common collocations
  • a loud quack
  • the quack of a duck
  • make a quack

Grammar Patterns

a quack

the quack of + noun

Usage Note

Almost always concrete and countable. Can describe the sound of real ducks, toy ducks, or imitations. The verb form (sense verb/1) is far more common than the noun.

quack — verb

quack — adjective

Word family

  • quackery
    nounC2
  • quackish
    adjectiveC2

Synonym discussion

Sense: noun/1

All four words describe people who deceive others, but the speaker chooses between them based on field, register, and what is being faked. 'Quack' is the sharpest and most specific: it points only at medicine, and it implies real harm to patients, not just embarrassment. 'Charlatan' is broader and more bookish — it can label a fake expert in art, politics, religion, or science. 'Fraud' is the most general, naming anyone who lies for money or status, with no field attached. 'Impostor' shifts the focus from the lie itself to the pretended identity: an impostor is pretending to BE someone (a real doctor's twin, a famous scientist), while a quack is pretending to DO something (cure your illness). Compare: 'The charlatan sold counterfeit paintings to museums,' 'The quack told dying patients his syrup would cure them,' and 'The impostor wore a stolen badge to enter the hospital.'

quack ↗charlatan ↗fraud ↗impostor ↗

Common collocations

Nouns

Adverbs

Phrases

  • expose a quack
  • see the quack

Prepositions

  • about (a disease/cure)
  • at (a fair/market)

Etymology

DutchEnglish

Short for 'quacksalver', an older word borrowed from Dutch in the 1500s. The Dutch 'kwakzalver' put together 'kwakken' (to boast loudly, almost to shout out) with 'zalf' (salve or ointment), painting the picture of a street seller shouting about his miracle creams. Over time English shortened the word to just 'quack', and the duck-noise sense developed separately in the 1600s from the simple imitation of the bird's call.