English Reference

Word

zack

Phoneticsza·ck

/ˈzæk/

Definitions

01a sixpence coin

C2

n. an old Australian name for a sixpence coin.

n. a historical Australian slang term for a sixpence coin, used before the decimalisation of currency.

“My grandfather told me he could buy a whole bag of sweets for a zack.”

“In the mid-twentieth century, a zack was a common unit of currency for small daily purchases among working-class Australians.”

Archaic · Dialect · Informal · British English

Usage

Commonly used in the phrase 'not worth a zack' to mean something is worthless.

Synonyms

02a prison sentence

C2 · Law

n. a slang word for a prison sentence of six months or six years.

n. a slang term for a custodial sentence, specifically one lasting six months or six years.

“The old thief had served a zack in the state prison for his crimes.”

“The convict was released after serving a full zack, though the harsh conditions of the era had clearly taken their toll on his health.”

Archaic · Dialect · Slang

Synonyms

Real-World Examples

“Even the Green Party has criticised aspects of government policy, with its leader, Zack Polanski, saying the current approach to net zero is not delivering for ordinary people.”
BBC News · 15 Apr 2026

This entry

Level
C2 · Proficiency
Frequency
Frequent
Updated

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