| out of collar |
| out of gas |
| out of kilter |
| out of one's depth |
| out of one's league |
| out of proportion |
| out of sight |
| out of the blue |
| out of the gate |
| out of the running |
| out of thin air |
| out on a limb |
| out-paramour the Turk |
| outside chance |
| outside world |
| over and over again |
| over one's skis |
| over the hills and far away |
| over the transom |
| oat opera |
| odds and ends |
| of a kind |
| of all things |
| off and running |
| off-color |
| offer up |
| off one's box |
| off one's hinge |
| off one's tits |
| off-roader |
| off the beaten track |
| off the grid |
| off the reservation |
| off the top of one's head |
| of late |
| often wrong, never in doubt |
| of the same stripe |
| oh my |
| oh well |
| old as the hills |
| old fart |
| old hand |
| old salt |
| old stager |
| on account of |
| on a first-name basis |
| on all fours |
| on an irregular basis |
| on a shoestring |
| on average |
| on board |
| once bitten, twice shy |
| once or twice |
| on demand |
| one-and-done |
| one big happy family |
| on edge |
| one-hit wonder |
| one in the eye for |
| one more again |
| one-off |
| one's back is up |
| one's days are numbered |
| one's hour |
| one's lips are sealed |
| one's socks off |
| one step forward, two steps back |
| one thing or another |
| one up |
| on good terms |
| on in years |
| on one's bill |
| on one's last legs |
| on one's toes |
| on purpose |
| on solid ground |
| on someone's hands |
| on strike |
| on tenterhooks |
| on the back of |
| on the bounce |
| on the button |
| on the cuff |
| on the dot |
| on the dry |
| on the face of it |
| on the front burner |
| on the gripping hand |
| on the hoof |
| on the house |
| on the level |
| on the mat |
| on the one hand |
| on the outside, looking in |
| on the prowl |
| on the radar |
| on the ready |
| on the run |
| on the side of the angels |
| on-the-spot |
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