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Adjective: on fire
  1. Flaming as it burns
    "forests set on fire by lightning"; "houses on fire";
    - ablaze, afire [literary], aflame, aflare [rare], alight, burning, in flames
     
  2. [informal] Performing very well

See also: lighted, lit

Nearest

on average
on board
on call
on camera
on cloud nine
on demand
on earth
on edge
on end
on faith
on fire
on fleek
on guard
on hand
on hold
on ice
on it
on message
on occasion
on one hand
on one's guard