| 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. |
| on principle |
according to one's principles. |
| on purpose |
deliberately; intentionally. |
| onrush |
a powerful flow or forward movement. |
| on sale |
available to buy at a lower price. |
| on-screen |
occurring in a motion picture or television program, or on a projection screen. [2 definitions] |
| on second thought |
after thinking it over; upon reconsideration. |
| onset |
the early stage; beginning. [2 definitions] |
| onshore |
to, toward, near, or on a coast or shore. [3 definitions] |
| on-site |
on or at the usual location of something. |
| onslaught |
a forceful, often sudden, offensive maneuver; attack. |
| on someone's coattails |
by association with someone else. |
| onstage |
on the performing area of a stage, or pertaining to things, actions, or the like on such an area. [2 definitions] |
| on tap |
ready to be served from a cask, as beer or ale. [2 definitions] |
| Ontario |
a south central Canadian province on the Great Lakes. [2 definitions] |
| on tenterhooks |
in a condition of anxiety, tension, or uneasy suspense. |