Related Clues:

• 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
• Proceeded with caution
• Emulated a cat burglar
• Moved steathily or cautiously
• Tried to move silently, say