a ball at which masks are worn.
a ball at which masks are worn
Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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She was the fascinating outsider at the masked ball in a company of congenial, if often over-bred, bores.
Society is a masked ball, where every one hides his real character, and reveals it by hiding.