Twofer swim
noun - A twofer swim (or two-fer) is when two people swim together shoulder-to-shoulder in the open water, usually comfortably going at the same pace for the entire swim or extended periods. A twofer swim is different from a group swim when more than two people are swimming in a group.
Alternate meanings
A twofer swim can also refer to two swimmers swimming at the same time and at the same pace during an open water swim using the same kayaker or paddler. As in, "Lexie and Parks did a twofer swim around Naples Island on Saturday."
A twofer swim can also refer to two swimmers on a marathon swim going the same pace while sharing the same escort boat and crew. As in, "Marcia and John did a twofer in the Catalina Channel."
A twofer swim can also mean the same swim done twice, usually in the same day with a different group of swimmers. As in, "After she swam around the island by herself, she did a twofer swim with the triathletes."
A twofer swim can also to one swimmer competing in two different races on the same day at the same venue. As in, "He first did the 1-mile race in the morning and then did a twofer swim when he did the 3-mile Gatorman race."
Synonyms
pair swim, duo swim, joint crossing