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Children's Dictionary
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on the air broadcast on radio or television.
on the average usually; generally.
on the ball acting in a quick and able way. [2 definitions]
on the blink broken; needing repair.
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.