The present participle of canoe; the activity of paddling and traveling in a canoe for sport or recreation.
From 'canoe' (verb) plus the gerund suffix '-ing.' This transforms the noun 'canoe' into a verb (to canoe) and then into a gerund representing the activity.
Making a noun into a verb (canoe→canoe) then into a gerund (canoing) is perfectly natural in English—we do it all day with ski→skiing, bike→biking—it's how the language stays flexible and current.
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