Definitions

1. verb

to cause or become visible, especially through the removal of obstructions

“The new development will sighten the hidden beach, making it accessible to the public.”

2. verb

to provide a view or a sight, especially of a scenic or attractive area

“The new skyscraper will sighten the city skyline.”

3. verb

to make something more visible or noticeable

“The new lighting system will sighten the dark corners of the room.”