a long-distance walk organized to raise money for charity
walkathon in American English
(ˈwɔkəˌθɑn)
noun
1.
a long-distance walking race for testing endurance
2.
such a contest held to raise funds for a charity or special cause, with supporters or sponsors pledging to donate a sum for a specific contestant or team for each mile walked or for the total miles covered
Word origin
[1930–35; walk + -athon]This word is first recorded in the period 1930–35. Other words that entered Englishat around the same time include: kickback, logical positivism, preset, saddle stitch, technical foul