What is the meaning of Recumbent?

Lying down.

Inactive; idle.

A bicycle or tricycle that places the rider in a reclined posture.

A large rectangular monolith lying on its side, typically flanked by two large upright stones, the flankers; found in recumbent stone circles of Aberdeenshire, Scotland, and the counties of Cork and Kerry in south-west of Ireland.

third-person plural future active indicative of recumbō

Source: wiktionary.org