ruse

Old French ruse, from reuser, 'to go back, to retreat,' described the tactic of hunted animals — particularly deer — who, when closely pursued, would turn sharply back along their own trail, then leap sideways, leaving the hounds following a scent that suddenly ended. The ruse was the animal's survival strategy: deception through misdirection.

Falconry and hunting manuals of medieval France documented ruses carefully — the double-back (retracing steps), the stream crossing (to lose scent), the leap to a rock (to break the scent trail). The hunted animal's intelligence in evading its pursuers was a recognized skill, and the vocabulary for it was specific. Ruse was the general term for any evasive maneuver.

By the 14th century, ruse had shifted from animal evasion to human cunning. The same word that described a deer's trick now described a soldier's stratagem, a merchant's deception, a courtier's maneuver. The hunting metaphor collapsed into metaphor: any deceptive stratagem was a ruse.

English borrowed ruse in the 17th century, already fully metaphorical. The deer is long gone from the word. But the essential quality remains: a ruse is not brute force or direct action — it is indirection, the double-back, making the pursuer follow a scent that leads nowhere. The hunted animal's wisdom preserved in human cunning.