射す

1. Origins, structure, and basic meaning

• Structure: Spelling: 射す. Reading: さす. Core meaning: to shine; to stream in.
• Basic usage: Representative examples: 窓から朝日が射すと部屋が明るくなった / 雲の切れ間から一筋の光が射した.

2. Common pitfalls and similar expressions

• The spelling used for light
  • Here 射す is used for sunlight or a ray of light shining into a place. Distinguish its spelling from homophonous verbs such as 差す, used for opening or holding an umbrella.