| 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] |
| on one's feet |
in a standing position. [3 definitions] |
| on one's mettle |
in a position to demonstrate inner reserves of good character or spirit. |
| on one's own |
alone or without anyone's help. |
| on one's toes |
(informal) alert and ready to respond or act. |
| on one's way |
during one's journey to a place; enroute |
| on pain of |
subject to the penalty or punishment of. |
| on pins and needles |
highly excited, nervous, or anxious, esp. in anticipation of something; filled with suspense. |