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Adverb:
on earth
Usage: informal
Used with
question
words
to
convey
surprise
"what on
earth
are you
doing
?"
on appro
on approval
on average
on balance
on board
on call
on camera
on cloud nine
on demand
on duty
on earth
on edge
on end
on faith
on fire
on fleek
on guard
on hand
on hold
on ice
on it