tailwind

A tailwind is a wind that blows from behind and helps something move in the direction it is already traveling. You can picture a plane, a ship, a bicycle, or even a runner getting a helpful push from the air behind them. In travel and transport, a strong tailwind can make a trip faster and sometimes use less fuel or energy.

The word is also widely used as a metaphor. In this broader sense, a tailwind is any outside condition that makes success or progress easier. In business, it might mean strong demand, lower costs, or a healthy economy. In politics, it can mean rising public support. In personal life, it can be the kind of timing or circumstance that suddenly makes your efforts work better.

So the core idea stays the same in every use: something is helping push you forward. That help usually comes from outside, and it makes movement, growth, or success easier than it would be otherwise. People often use the word in contrast with "headwind," which means pressure or conditions that slow you down instead.