bonk
v.— «But there is also the flip side, when fatigue hits all sets of muscles at once. If you’ve been riding hard and then start running, often it feels as if your thigh bones are no longer attached to your shinbones. Experienced athletes call this “cross-bonk.”» —“‘Go For It’: Making Your Way In A Triathlon” by Suzanne Charle New York Times Sept. 23, 1984. (source: Double-Tongued Dictionary)
Further reading
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