Browse the English Dictionary
- on the tip of one's tongue on the town on the trot on the understanding that on the up on the up and up on the upside on the upswing on the verge of on the wane on the warpath on the watch for on the water wagon on the wrong side of (an age) on the wrong side of the law on the/someone's/something's way out on their best behavior on tick on tiptoe on top on tour on tow on trial on vinyl on waivers on welfare on what basis on your mark on-again, off-again on-air on-base percentage on-dit on-glaze
- on-glide on-license on-off on-plant on-ramp on-site on-target on-the-job on-the-job-training on-year on/as a lark on/at first acquaintance on/at the point of (doing something) on/at the receiving end on/at the threshold on/off one's back on/under false pretenses on/under/with the assumption on/upon impact on/upon reflection onager onagra onanism onboard onboarded onc- once again once again/more once and again once bitten, twice shy once in a blue moon once in a lifetime once or twice
- once that once upon a time once-accented octave once-born once-over once-over-lightly oncer oncet onch- onchia onchocerciases oncidium onco- oncochaeta oncogene oncogenesis oncogenic oncogeny oncologic oncome oncomer oncoming oncost oncotomy onct ondes martenot ondine onding ondium martenot ondograph ondule ondy ondé