| oncoming |
coming toward or near; approaching. [2 definitions] |
| on deck |
in baseball, next in line to bat. [2 definitions] |
| one |
being single in number. [11 definitions] |
| on edge |
nervous or anxious; full of worry. [2 definitions] |
| oneself |
a person's own self (often used reflexively). |
| one-sided |
advantageous to one side or position. [3 definitions] |
| one-way |
proceeding in or restricting motion to a single direction. [3 definitions] |
| on fire |
burning; in flames. [3 definitions] |
| on foot |
by walking. |
| ongoing |
existing continuously from some time in the past into the present. |
| on guard |
alert and prepared. |
| on hand |
readily available. |
| onion |
a round, sharp-tasting bulb used extensively in cooking and as a flavoring. [2 definitions] |
| on (one's) last legs |
having very little remaining energy, strength, hope, or ability to function; liable to collapse or die. |
| online |
connected to or reached through a computer or computer network. [3 definitions] |
| only |
solely; as the sole instance. [8 definitions] |
| on occasion |
now and then; irregularly. |
| on one's toes |
(informal) alert and ready to respond or act. |
| on purpose |
deliberately; intentionally. |
| onset |
the early stage; beginning. [2 definitions] |
| on tap |
ready to be served from a cask, as beer or ale. [2 definitions] |