saびるbiru
1.

To undergo a chemical change resulting in the formation of corrosion on a metallic surface, often characterized by a reddish-brown layer that diminishes the material's integrity and functionality.

2.

To experience a change in vocal quality, becoming deeper and more subdued, often indicating maturity or a shift in emotional tone.

3.

To develop an aged or weathered appearance, suggesting a sense of timelessness or somber beauty due to the passage of time.

Example:

雨の中に放置しておくと自転車はさびるでしょう。

さびsabisabi
1.

A deterioration or corrosion of metal resulting from exposure to moisture and air, typically manifesting as a reddish-brown or bluish discoloration that weakens the material.

2.

The formation of solid oxides or hydroxides on a metal's surface due to the chemical reactions with oxygen present in the atmosphere or water.

3.

A metaphorical expression of a negative consequence that arises from one’s own actions or behavior.

Example:

この車はに強い。

saびつくbitsuku
1.

To undergo a process where metal becomes corroded and covered with iron oxide, often as a result of prolonged exposure to moisture and air.

2.

To reach a state where objects, particularly metal, degrade and lose their functional properties due to oxidation, resulting in a flaky, deteriorated appearance.

3.

To experience a decline in quality or effectiveness, similar to how metal deteriorates, often used metaphorically to describe a loss of vitality or skill over time.

4.

To become encrusted with rust, indicating neglect or age, leading to a breakdown of structure and usability.

Example:

さびつかせるよりもすり切らしたほうがいい。