Definitions from Wiktionary (tailwind)

▸ noun:  (nautical, physics) A wind that blows in the same direction as the course taken by an aircraft, sailing ship, bird, etc.
▸ noun:  (figurative, by extension) A force that accelerates progress.
▸ verb:  Of a wind, to blow on a windmill or wind turbine in such a way that wind pressure is exerted on the wrong side of the sail or turbine assembly.
▸ Also see tailwind

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