1. The internal mechanism of a device
   - works 
2. A mine or quarry that is being or has been worked
   - working

Type of: excavation, mechanism

• side order
• side pocket
• side road
• side street
• side view
• side yard
• side-blotched lizard
• side-glance
• side-look
• side-to-side
• side-wheeler
• side-whiskers
• sidearm
• sideband
• sidebar
• sideboard
• sideburn
• sidecar
• sidehill
• sidekick
• sidelight
• sideline
• sidelong
• sideman
• sidepiece