On cloud nine

adjective phrase

At the very pinnacle of bliss; euphoric; on a cloud: She came back home and he’s on cloud nine (1950s+)
Blissfully happy, as in Ever since he proposed to her, her parents have been on cloud nine. The exact allusion of nine in this term is unclear, and different figures, especially seven (perhaps alluding to seventh heaven), are sometimes substituted. [ ; mid-1900s ]


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