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on an individual basis
on an irregular basis
on and off
On and on
on approval
on average
on base
On behalf of
On board
on camera
on commission
On condition
On demand
On dit
On draught
on duty
-- on earth --
on edge
On end
On even ground
On even keel
on faith
On file
on fire
on guard
on hand
On height
on her own
On high
on his own
On horseback
on it
on land

on earth

Adv.

1.

on earth - used with question words to convey surprise; "what on earth are you doing?"

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