Décolleté [da-coal-ta]
.Nothing even décolloté should be uttered before ladies—i.e. bearing the least semblance to a double entendre. Décolleté is the French for a “dress cut low about the bosom.”
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.