Longman Dictionary of Contemporary English
Wiktionary
n. (context games racing English) A race, in which a team of two players are joined together at opposite ankles, and must complete a short sprint before the other teams.
Wikipedia
A three-legged race involves two participants attempting to complete a short sprint with the left leg of one runner strapped to the right leg of another runner. The object is for the partners to run together without falling over, and beat the other contestants to the finish line.
The longest distance run three-legged in 24 hours is 109.8 km (68.23 miles) and was achieved by Mark Howlett (Ely, Cambs, England) and Rab Lee (Bo'ness, Scotland), at the Glenmore 24 Hour Trail Race, in the Cairngorms National Park, Scotland, UK, on 7–8 September 2013. This is also the longest distance ever run three-legged.
Usage examples of "three-legged race".
The only exercise they were able to engage in was walking, which they managed in the manner of a three-legged race.
You sign the paper, you belong to the union, you get a discount on your insurance, you never see me but for the yearly picnic, where we act chummy and do the three-legged race.
I'd figured we could run down the beach together, kind of like a three-legged race, with Cat staying off his bad leg.
Martina jumped to it, and I followed in my three-legged race as the cab slowed further, and halted.
The Bandits took the Three-Legged Race and Mike's team took the Sack Hop.
When the girls were told to choose partners for a three-legged race, four tried to seize Niall simultaneously.
His neck hurt, his head hurt, and Hood pressed against him like an unwanted partner in a three-legged race.
And so, like the hopeless pair in a three-legged race who trail in last to a round of sympathetic applause, we arrived at the attic room still alive.