Related Clues:

• Went on all fours, e.g.
• Moved sneakily
• Moved like some reptiles
• Crawled cautiously
• Moved quietly
• Proceeded through a traffic jam, e.g.
• Went on all fours
• Snuck
• Slithered
• Edged
• Approached with stealth
• Slunk
• Advanced very slowly
• Was sluggish?
• Moved on hands and knees