| one-upmanship |
the method, practice, or habit of always trying to surpass or gain an advantage over others so as not to be bettered. |
| 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. |
| on her beam-ends |
of a ship, tipping so far to one side as to be nearly capsizing. |
| on hold |
waiting to complete a telephone call. |
| on ice |
(informal) in reserve. |
| onion |
a round, sharp-tasting bulb used extensively in cooking and as a flavoring. [2 definitions] |
| onionskin |
a translucent paper, often used for typing. |
| 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] |
| onlooker |
someone who watches; observer; spectator. |
| only |
solely; as the sole instance. [8 definitions] |
| on occasion |
now and then; irregularly. |
| onomastic |
of or relating to proper names. |
| onomastics |
(used with a sing. verb) the study of the origins, history, and forms of proper names. [2 definitions] |
| onomatopoeia |
the formation or use of words whose sounds suggest the meanings of the words, such as "bang," "moo," or "jingle". |
| Onondaga |
a member of a tribe of North American Indians inhabiting the area around Onondaga Lake in New York State and belonging to the Six Nations. [2 definitions] |