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1
a
: to propel oneself in water by natural means (such as movements of the limbs, fins, or tail)
b
: to play in the water (as at a beach or swimming pool)
2
: to move with a motion like that of swimming : glide
a cloud swam slowly across the moon
3
a
: to float on a liquid : not sink
b
: to surmount difficulties : not go under
sink or swim, live or die, survive or perish—
Daniel Webster
4
: to become immersed in or flooded with or as if with a liquid
potatoes swimming in gravy
5
: to have a floating or reeling appearance or sensation
https://www.merriam-webster.com/dictionary/swim
Apparently, swimming inherently requires a liquid.