In respect of paddling, swimmer refers to to a former paddler. That is someone who's fallen out of their boat.

swimmer

A counterfeit old coin.
swimmer

A ship.

I shall have a swimmer ; a cant phrase used by thieves to signify that they will be sent on board the tender.

The 1811 Dictionary of the Vulgar Tongue.

Swim"mer (?), n.

1.

One who swims.

2. Far.

A protuberance on the leg of a horse.

3. Zool.

A swimming bird; one of the natatores.

Little swimmer Zool., a phalarope.

 

© Webster 1913.

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