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

• prolixity
• prolixly
• prolixness
• prolocutor
• Prolog
• prologise
• prologize
• prologue
• prologuise
• prologuize
• prolong
• prolongation
• prolonge
• prolonge knot
• prolonged
• prolonged interrogation
• prolusion
• prolusory
• prom
• promenade
• promenade concert
• promenade deck
• promethazine
• Promethean
• Prometheus