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- only on no account on occasion on one's doorstep on one's mettle on one's own on one's own hook on one's own initiative on one's toes on pins and needles on purpose on record onrush onrushes onset onsets onslaught onslaughts on tap on-target on tenterhooks on the alert on the ball on the bias on the blink on the button on the cards on the contrary on the diagonal on the double on the far side of on the fence on the fritz on the go
- on the house on the level on the money on the move on the nose on the order of on the other hand on the qui vive on the rack on the shelf on the spot on the spur of the moment on the surface on the warpath on the whole on tiptoe on top of onus onuses onward onwards oodles ooh oohed oohing oohs oomph oops ooze oozed oozes oozing oozy opacity
- opalescent opalescently opaque opaqueness open open (up) open-air open air open-and-shut open arms open door open doors opened opened (up) open-ended open-eyed openhanded openhandedly openhandedness openhearted openheartedly openheartedness opening opening (up) openings open letter open letters openly open-minded open-mindedness openmouthed openness