Defn: One of two straps, chains, or ropes of a harness, extending from the collar or breastplate to a whiffletree attached to a vehicle or thing to be drawn; a tug.
The horse of an ammunition cart put its leg over a trace. “Hey, look at the trace horse! . . . Get her leg out! She’ll fall. . . . Ah,
Leo Tolstoy. War and Peace: 10 (Book Ten)
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He had unhitched her from the plow and she still had on her collar, the traces draped over her neck.
Olive Ann Burns. Cold Sassy Tree, p.109 (1984)
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All night there were coaches in my broken sleep, going to wrong places instead of to London, and having in the traces, now dogs, now cats, now pigs, now men,—never horses.
Charles Dickens. Great Expectations (1861)
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A touch of a spurred heel made his horse first start and rear, and then bound away; the dog rushed in his traces; all three vanished,
Charlotte Brontë. Jane Eyre (1847)
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when he got tangled in the traces and delayed the start, both Dave and Solleks flew at him and administered a sound trouncing.