Definition of "tailwind" in English

noun

1. (nautical, physics) A wind that blows in the same direction as the course taken by an aircraft, sailing ship, bird, etc.; a following wind.

2. (figurative, by extension) A force that accelerates progress.

verb

1. 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.