What is the meaning of Lull?

A period of rest or soothing.

A period of reduced activity; a respite.

A period without waves or wind.

An extended pause between sets of waves.

To cause to rest by soothing influences; to compose; to calm

To become gradually calm; to subside; to cease or abate.

to stand without support (of a toddler)

Used to lull (a child) to sleep.

Source: wiktionary.org