[on the stage] {adv.} or {adj. phr.} In or into the […]

[on the town] {adv.} or {adj. phr.}, {informal} In or into […]

[on the up and up] {adj. phr.}, {informal} Honest; trustworthy; sincere. […]

[on the warpath] {adj. phr.}, {informal} 1. Very angry. * /When […]

[on the watch] {adj. phr.} Alert; watchful. * /The customs inspector […]

[on the way] or [on one's way] {adv.} or {adj. phr.} […]

[on the wing] {adv.} or {adj. phr.} 1. In the air; […]

[on time] {adv.} or {adj. phr.} 1. At the time arranged; […]

[on top] {adv.} or {adj. phr.}, {informal} In the lead; with […]

[on top of the world] or [sitting on top of the […]