[on the lookout] {adj. phr.} Watching closely. * /The little boy […]

[on the loose] {adj. phr.}, {informal} Free to go; not shut […]

[on the make] {adj.}, {slang} 1. Promiscuous or aggressive in one's […]

[on the map] See: [PUT ON THE MAP].

[on the market] {adj. phr.} For sale. * /In the summer […]

[on the mend] {adj. phr.} Healing; becoming better. * /John's broken […]

[on the move] {adj.} or {adv. phr.} 1. Moving around from […]

[on the nose] {adv. phr.}, {informal} Just right; exactly. * /Stanley […]

[on the other foot] See: [SHOE ON THE OTHER FOOT].

[on the other hand] {adv. phr.} Looking at the other side; […]