Downswing (noun)

The downward motion or phase of a swing or cycle.

Origin:

Mid 19th century: from down + swing.

Examples:

1. The stock market was in a downswing.
2. He was in the downswing of his career.
3. The downswing of the pendulum.
4. The downswing of the economy.
5. The downswing of the business cycle.