What does the word brighten mean?

Usage examples for brighten

  1. If they had been watching Fan Harding they would have seen his face brighten up at this. – The Girl Aviators and the Phantom Airship by Margaret Burnham
  2. Only upon reaching our destination did my companion brighten a bit. – Ruggles of Red Gap by Harry Leon Wilson
  3. An adventure, a bit of experience of some kind, is what one wants when he goes forth to admire woods and waters,- something to create a draught and make the embers of thought and feeling brighten. – Locusts and Wild Honey by John Burroughs