either of two saclike respiratory organs in the chest of vertebrates; serves to remove carbon dioxide and provide oxygen to the blood
REST
be at rest
stay the same; remain in a certain state; "The dress remained wet after repeated attempts to dry it"; "rest assured"; "stay alone"; "He remained unmoved by her tears"; "The bad weather continued for another week"
take a short break from one's activities in order to relax
give a rest to; "He rested his bad leg"; "Rest the dogs for a moment"
rest on or as if on a pillow; "pillow your head"
sit, as on a branch; "The birds perched high in the tree"
not move; be in a resting position
put something in a resting position, as for support or steadying; "Rest your head on my shoulder"
be inactive, refrain from acting; "The committee is resting over the summer"
be inherent or innate in;
freedom from activity (work or strain or responsibility); "took his repose by the swimming pool"