The present participle of 'coxswain': the act of serving as a coxswain and steering/commanding a rowing boat.
From 'coxswain' + '-ing' (present participle suffix). Like 'cox' and 'coxing,' this shows the noun 'coxswain' being used as a verb in rowing contexts.
Rowing created three ways to say the same thing—cox/coxing, coxswain/coxswaining—and rowers use whichever matches their style, showing how tight-knit communities develop their own language variations!
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