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on the contrary	not agreeing with something already said.
on the dot	(informal) exactly on time; punctually.
on the double	(informal) right away; immediately.
on the house	free, as a gift from a business.
on the mend	getting better after an injury.
on the off chance	with the very slight possibility; against the slight hope.
on the shelf	not in use at the present time; put aside until later.
on the sly	secretly; in a crafty way.
on the spot	at once; immediately. [2 definitions]
on the spur of the moment	without much thought.
on the whole	all things considered; in general.
on tiptoe	standing or walking on the toes, especially to proceed quietly or cautiously. [2 definitions]
onto	to a position on or on top of. [2 definitions]
on top of	in total control of. [3 definitions]
onward	toward a point or position ahead in space or time. [2 definitions]
ooze¹	to leak out slowly. Liquids, gases, and sounds may ooze.
opal	a mineral that is white, black, blue, or yellow. Opals are used as gems.
opaque	not letting light pass through. [2 definitions]
OPEC	an association made up of several Arab nations that sell the oil they produce to other countries. "OPEC" is an abbreviation of "Organization of Petroleum Exporting Countries."
open	allowing something or someone to pass through or to get to the inside; not shut or closed. [16 definitions]
opener	someone or something that opens. [3 definitions]

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