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

• haven't
• haver
• Haverhill fever
• haversack
• Haversian canal
• havildar
• havoc
• haw
• haw-haw
• Hawaii
• Hawaii Island
• Hawaii Standard Time
• Hawaii Time
• Hawaii Volcanoes National Park
• Hawaii'i
• Hawaiian
• Hawaiian capital
• Hawaiian dancing
• Hawaiian goose
• Hawaiian guitar
• Hawaiian honeycreeper
• Hawaiian Islands
• hawala
• hawfinch
• hawk