[on duty] {adj. phr.} Doing one's job; supervising. * /Two soldiers […]

[on easy street] {adj. phr.}, {informal} Having enough money to live […]

[on edge] {adj. phr.} Excited or nervous; impatient. * /The magician […]

[on end] {adj. phr.} Seemingly endless. - Used with plural nouns […]

[on foot] {adv.} or {adj. phr.} 1. By walking. * /Sally's […]

[on guard] {adj. phr.} Watchful; watching. * /The police warned people […]

[on ice] {adv.} or {adj. phr.}, {slang} 1. The same as […]

[on one's back] {adj. phr.}, {informal} Making insistent demands of you; […]

[on one's bad side] or [on the bad side of one] […]

[on one's chest] {adj. phr.}, {informal} Hidden in your thoughts or […]