Related Clues:

• Approach stealthily
• Enter quietly
• Enter surreptitiously
• Enter stealthily
• Enter on tiptoe
• Add surreptitiously
• Enter on the sly
• Prepare to surprise, with "on"
• Mention casually
• Enter furtively
• Add sneakily
• Enter on tippytoe
• Get closer, really quietly
• Prepare to pounce
• Arrive on the sly