Definition of "marathoning" [marathoning]

• The act of running a marathon (noun)

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• "I was busy converting someone into a Macross fan through the "marathoning" of the entire Frontier series with him."
• "She transferred to a fancy schmancy private school when we started high school and we saw less and less of each other until something nerdy was brought up at some mutual gathering and we began our marathoning ways."
• "After Buffy, marathoning movies and TV shows became our thing."