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be (or jump) over the moon - be very happy.
feeling, showing, or expressing extreme joy; very pleased
This person was lean and brown, his eyes were extremely clear; he held himself very straight and looked fit to be over the moon. (J. Galsworthy, ‘The Little Man and Other Stories’, ‘The Perfect One’

‘It's only a few weeks since you were over the moon about Davina.’ ‘Well, now I'm not.’ (P. H. Johnson, ‘The Survival of the Fittest’, part VI, ch. V)
by Inessik February 26, 2009
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