Definition of St. Valentine's Day Massacre in English:

St. Valentine's Day Massacre

Syllabification: St. Val·en·tine's Day Mas·sa·cre
The shooting on February 14, 1929, of seven members of the rival “Bugsy” Moran’s gang by some of Al Capone’s men disguised as policemen.

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Word of the day hypnopompic
Pronunciation: ˌhɪpnə(ʊ)ˈpɒmpɪk
adjective
relating to the state immediately preceding waking up