Definition of "lean back" []

• Move the upper body backwards and down (verb)

WordNet. Princeton University. 2010.

• "Sisko tried to lean back in his acceleration seat, but of course there was no gravity field to aid his maneuver—only the two chestcrossing straps that kept him from floating out of the seat."
• "Not much has changed since 1976—the cinder-block walls are still cold against my shoulder blades when I lean back against them; the mug shot area is tucked into a small alcove beside the pre-intake booth; the smell of industrial cleaner seeps through the air every time a detention officer opens the door to lead another man inside."
• "I see Emma Wasserstein lean back as Elise taps her on the shoulder."