nursery transplant - one's orders
- on shipboard
- on shore
- on short notice
- on sick leave
- on sight
- on site
- on someone's account
- on someone's heels
- on spec
- on speculation
- on stilts
- on stream
- on sufferance
- on suspicion
- on suss
- on tap
- on target
- on tenterhooks
- on that day
- on that score
- on the 10th proximo
- on the air
- on the alert
- on the analogy of
- on the anvil
- on the assumption of
- on the authority of the press
- on the average
- on the ball
- on the beam
- on the blink
- on the brink of ruin
- on the brink of the grave
- on the cards
- on the carpet
- on the chance of
- on the cheap
- on the co op
- on the contrary
- on the crest of the wave
