heru
1.

To experience a noticeable reduction in quantity or degree over time, often referring to aspects such as weight, resources, or population.

2.

To become less in amount or intensity, indicating a decrease that is observable or impactful in a given context.

3.

To feel hunger or emptiness, often used when discussing the need for sustenance or food.

4.

To weaken or lose strength, illustrating a decline in capability or vitality.

5.

To show hesitation or fear, particularly in contexts where one may be expected to act bravely or assertively.

Example:

会員は5人に減った。

すりsuriheru
1.

A state where an object gradually loses its thickness or material due to friction or use over time, leading to a diminished appearance or functionality.

2.

The process by which something becomes less substantial or effective as a result of continuous pressure or wearing action, often resulting in a reduced overall quality.

3.

To experience a decrease in size or integrity, often linked to repeated contact or movement that erodes the surface or structure of an item.

Example:

この素材は決してすり減ったりしない。