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

[on the wagon] {adv. phr.} Participating in an alcohol addiction program; […]

[on the wane and on the wax] {adv. phr.} Decreasing and […]

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

[on the whole] {adv. phr.} 1. In the most important things; […]

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

[on the wrong track] {adv. phr.} Lost; pursuing the wrong lead. […]

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

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

[on trial] {adv.} or {adj. phr.} 1. For testing or trying […]