chiaroscuro /kyä-rō-skooˈrō/ (esp art)

1. Management or disposition of light and shade in a picture
2. A painting in black and white
3. The effect of light and shade or variety and contrast (also figurative)

• one and all
• one-and-thirty
• one another
• one-armed bandit
• on earth
• one by one
• one day
• one-day
• on edge
• one-dimensional
• one-er
• one-eyed
• one fell swoop
• one flesh
• onefold
• one for his nob
• one for the road
• one-handed
• one-horse
• one-horse race
• one-horse races
• one-idea'd
• one in a million
• one in a thousand
• one in the eye