下降

1. Origins, structure, and basic meaning

• Structure: 下降 is read かこう and means a physical descent or a decline in a value.
• Basic usage: It is used for a balloon moving downward and for a temperature trend declining on a graph.

2. Common pitfalls and similar expressions

• Physical descent
  • ゆっくり下降した describes a balloon slowly descending.
• Decline in a value
  • 気温が下降している describes a temperature that is declining.