白ける

しらけるshirakeru

ichidan verb · intransitive

1. to be dampened (of the mood, interest, etc.)
2. to be spoiled (e.g. of the atmosphere)
3. to become subdued
4. to turn sour
5. to become unamused
6. to become bored
7. to become apathetic
8. to turn white

Study it in Yanamino