| 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. |
| on the air |
broadcast on radio or television. |
| on the average |
usually; ordinarily. |
| on the ball |
acting with efficiency and competence. [2 definitions] |
| on the blink |
not functioning; needing repair. |
| on the carpet |
being reprimanded or closely questioned by someone in authority, such as one's employer. |
| on the contrary |
in contradiction to something already said. |
| on the dot |
(informal) exactly on time; punctually. |
| on the double |
(informal) right away; immediately. |
| on the downgrade |
losing rank, status, position, or wealth; declining. |
| on the house |
free, as a gift from a business establishment. |
| on the mend |
getting better, esp. in health; recuperating. |
| on the nose |
exactly. |
| on the off chance |
with the very slight likelihood; against the faint hope. |
| on the pad |
(slang) of a policeman, accepting a share of graft payments. |
| on the q.t. |
(informal) in stealth or secret; quietly. |