An old British coin or amount of money equal to two pence; historically a very small sum of money.
Contraction of 'two pence' (two + pence). Common in British English until decimalization in 1971 eliminated the coin.
The phrase 'not worth tuppence' meant worthless—a tiny amount that wouldn't buy anything. It disappeared from daily use in 1971, but survived in literature like Mary Poppins, making it timebound British slang.
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