- harness for a pair of horses.
- in double harness, Informal. married.
Origin of double harness
An Americanism dating back to 1865–70
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for double harness
It's the thoroughbreds that sweat when they're backed into double-harness.The Works of Rudyard Kipling: One Volume Edition
Decidedly, Liszt was not made for stepping in double-harness.Franz Liszt
I never thought of it before—which goes to show that this double-harness business puts a different face on 'most everything.North of Fifty-Three
Bertrand W. Sinclair