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Adjective: on top of the world
Usage: informal
  1. Full of high-spirited delight
    "After winning the competition, she felt on top of the world";
    - elated, gleeful, joyful, jubilant, cock-a-hoop [informal], gleesome [archaic]

See also: euphoric, exhilarated, exultant, exulting, gladdened, happy, high, in high spirits, joyous, jubilant, prideful, rejoicing, sublime [archaic], triumphal, triumphant, uplifted

Encyclopedia: On top of the world