Related Clues:

• Move at a snail's pace
• Lie in wait
• Move like ivy
• Lurk in the shadows
• Despicable sort
• Walk like a cat
• Inch along
• Move close to the ground
• Kind of thief
• Move sneakily
• Secretive sort
• Peeping Tom, e.g.
• Stalker, e.g.
• Gridiron maneuver
• Go at a snail's pace