sub rosa /sub rōˈzə or sŭb roˈzä/

1. Literally, under the rose (a traditional symbol of secrecy)
2. Hence, privately, confidentially

• half-lights
• halflin
• halfling
• halflings
• halflins
• half-lives
• half loaf
• half-loaf
• half-loaves
• half-marathon
• half-marathons
• half mast
• half-mast
• half masts
• half measure
• half measures
• half-miler
• half-milers
• half-moon
• half-moons
• half-mourning
• half nelson
• half-note
• half-notes
• half-one