Historical clue formulations

• Backless sofa — 2018-09-19
• Lounge piece — 2017-03-18
• Place to lounge — 2013-12-15
• Furniture usually with pillows — 2013-06-14
• Piece to lounge on — 2013-06-12
• Ottoman relative — 2013-03-29
• Ottoman relative — 2011-09-18
• Couch — 2007-10-22
• Sofa — 2006-10-19
• Parlor piece — 2006-06-10
• Parlor piece — 2003-06-15
• Couch — 2001-04-04
• Ottoman, e.g. — 1998-08-30
• Sofa — 1997-12-17