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In a state of ecstatic, euphoric bliss and supreme happiness.
"After winning the tournament, the entire team was on cloud nine."
"She has been on cloud nine ever since receiving the university acceptance."
Individual vocabulary building blocks comprising this expression
Traced to the 19th-century US Weather Bureau cloud classification, where "cloud nine" denoted towering, lofty cumulonimbus clouds reaching heights of 40,000 feet.
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