sub rosa /sub rōˈzə or sŭb roˈzä/

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

• life jacket
• life jackets
• lifeless
• lifelessly
• lifelessness
• lifelessnesses
• lifelike
• lifelikeness
• lifeline
• lifelines
• lifelong
• lifemanship
• lifemanships
• life-mortar
• life-mortars
• life of Riley
• life peer
• life peerage
• life peerages
• life peeress
• life peers
• life-preserver
• life-preservers
• lifer
• life raft