BLACK SWAN

PRONUNCIATION: (BLAK swan)

MEANING: noun:
1. An unpredictable occurrence that has major consequences.
2. Something extremely rare.

ETYMOLOGY: From the former belief that all swans were white until black swans were discovered in Australia in 1697.
Earliest documented use: 1570.
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BRACK SWAN - a graceful bird which swims in salty water

BACK SWAN - a retrograde popular dive

A-LACK SWAN - "SWN"