1. Without official authorization
   "he had made some money on the side"
   - unofficially

Encyclopedia: On the side

• out-herod
• out-migration
• out-of-body experience
• out-of-court settlement
• out-of-date
• out-of-door
• out-of-pocket
• out-of-school
• out-of-the-box thinking
• out-of-town
• out-tray
• outage
• Outaouais
• outargue
• outback
• outbalance
• outbid
• outboard
• outboard motor
• outboard motorboat
• outbound
• outbrave
• outbreak
• outbred
• outbuilding