recline

Short definition from Wiktionary

Verb

1. 1
   To cause to lean back; to bend back.
2. 2
   To put in a resting position.
3. 3
   To lean back.
4. 4
   To put oneself in a resting position.

Noun

1. 1
   A mechanism for lowering the back of a seat to support a less upright position; Also, the action of lowering the back using such a mechanism.