subside

Short definition from Wiktionary

Verb

1. 1
   To sink or fall to the bottom; to settle, as lees.
2. 2
   To fall downward; to become lower; to descend; to sink.
3. 3
   To fall into a state of calm; to be calm again; to settle down; to become tranquil; to abate.
4. 4
   To cease talking.