1. Off work, but available to provide a service if requested
   "I'm on call for my patients 4 days a week and every fourth weekend"

Encyclopedia: On call

• ruggedise
• ruggedization
• ruggedize
• ruggedly
• ruggedness
• ruggelach
• rugger
• rugose
• rugosity
• rugous
• rugulah
• Ruholla Khomeini
• Ruhr
• Ruhr River
• Ruhr Valley
• ruin
• ruinate
• ruination
• ruined
• ruiner
• ruining
• ruinous
• ruinously
• rule
• rule book