とおtooざかるzakaru
1.

To gradually move further away from a location or point of reference, becoming increasingly distant over time.

2.

To foster a sense of separation or estrangement, leading to diminished closeness or connection with someone or something.

3.

To experience a reduction in presence or intensity, often used in the context of sounds or events diminishing until they are no longer perceived.

Example:

船は岸壁からしだいに遠ざかって行った。