E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Ducks Egg.
Broke his ducks egg. Took his first school prize. In cricket a ducks egg or 0 in a score is broken by a run.
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What a proud and happy day it was to Lucy when little Herbert, in public-school parlance, broke his ducks eggotherwise, took his first prize.A Fellow of Trinity, chap. i.