Lounge

The word lounge, according to the OED, has an obscure origin. It is suspected to come from Lungis, but it is uncertain. The AHD believes it to come from the Indo-European root del meaning "long". The verb could have possibly come from allonger, meaning "to stretch out" in French. The sequence of this option comes from Latin prefix ad combined with longus (long). Once again, this is just speculation and nothing can be confirmed.

The definitions given by the AHD include;

1) To move or act in a lazy, relaxed, or idle way
2) A public waiting room often having smoking or lavatory facilities
3) An establishment or a room in an establishment where cocktails are served
4) A long couch, esp. one having no back and a headrest at one end