noun - Two-way (or two-way crossing or double-crossing) is a solo or relay swim back and forth across a channel, lake, river or other body of water under the traditional rules of marathon swimming. The swimmer set a two-way record across the Cook Strait. Synonym: double-crossing.
noun, adjective - Two-way is a solo open water swim or a relay that continues two consecutive times across a channel, lake, river or other body of water. Traditionally, there can be up to a ten-minute break at the shoreline between the first and second crossing.
The swimmer set the record for a two-way crossing in the Catalina Channel.
The relay negative split its two-way crossing of the English Channel, swimming one hour faster in the second crossing than the first.
She was planning on a two-way crossing of the Strait of Gibraltar.