Related Clues:

• Approached with stealth
• Slunk
• Did laps, perhaps
• Took a dip
• What Ian Thorpe did
• Did one leg of an Ironman competition
• Did the breaststroke, e.g.
• Advanced very slowly
• Kept one's head above water?
• Was sluggish?
• Dog-paddled, perhaps
• Stroked
• Did the crawl, say
• Moved on hands and knees
• Did the dog paddle