オン

In a sentence

• 音楽をオンにしてください。

  Please turn on the music.

  Here, 'オン' is used as a command to turn on something, typically electronic devices or sound systems.

• オンとオフの切り替え方法を教えてください。

  Please tell me how to switch between on and off.

  In this context, 'オン' is part of the concept of toggling a state, contrasting with 'オフ' (off).

• 彼の目にオンの輝きが見られた。

  There was an on shine in his eyes.

  Here, 'オン' metaphorically represents a state of activation or vitality, used symbolically to describe an energized quality.