lull

Short definition from Wiktionary

Noun

1. 1
   A period of rest or soothing.
2. 2
   A period of reduced activity; a respite.
3. 3
   A period without waves or wind.
4. 4
   An extended pause between sets of waves.

Verb

1. 1
   To cause to rest by soothing influences; to compose; to calm
2. 2
   To become gradually calm; to subside; to cease or abate.

Proper noun

1. 1
   A surname.