IdiomNatureEnglish

be on cloud nine

Meaning: to be extremely happy; in a state of bliss.

Example: “Since the adoption was approved, they've been on cloud nine.”

Origin: The US Weather Bureau cloud-classification origin is a well-known myth; the phrase likely uses 'nine' as a superlative (compare earlier 'cloud seven' and 'seventh heaven'). No documented meteorological link.

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