Related Clues:

• Did the doggy paddle
• Moved stealthily
• Moved furtively
• Used a natatory facility
• Didn't sink
• Kept one's head above water
• Crossed the Rubicon, maybe
• Did one-third of a triathlon
• Went for a dip
• Approached stealthily
• Moved at a crawl?
• Proceeded slowly
• Pussyfooted
• Did laps in a pool
• Dog-paddled