| on foot |
by walking. |
| ongoing |
continuing from sometime in the past into the present. |
| on guard |
alert and prepared. |
| on hand |
ready right there. |
| onion |
a round bulb with a sharp taste and smell. Onions are used in cooking and as a flavoring. [2 definitions] |
| on (one's) last legs |
having very little energy, strength, hope, or ability to go on; likely to collapse or die. |
| online |
connected to or reached through a computer or computer network. [2 definitions] |
| only |
as the single instance. [5 definitions] |
| on occasion |
now and then; irregularly. |
| on one's toes |
(informal) alert and ready to act. |
| on purpose |
not by accident; deliberately. |
| onset |
the early stage; beginning. [2 definitions] |
| on tap |
ready to be served from a cask. [2 definitions] |
| Ontario |
a south central province of Canada that lies on the north shore of the Great Lakes. Its capital is Toronto. [2 definitions] |
| 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. |