Historical clue formulations

• Operculum, e.g. — 2026-05-16
• Box top — 2026-03-30
• Eye covering — 2025-08-21
• Top hat? — 2025-07-09
• Cover — 2025-04-03
• Kettle component — 2025-01-21
• What's seemingly impossible to find when storing leftovers — 2024-11-03
• Free coffee shop item — 2024-06-13
• Tupperware top — 2023-11-13
• Tub top — 2023-09-22
• Something to pry or twist off — 2022-10-16
• Top of a can — 2022-09-07
• Tupperware topper — 2022-09-06
• Part of the eye that blinks — 2022-03-21
• Jar cover — 2022-01-31
• Jar topper — 2021-09-27
• Jack-in-the-box part — 2021-06-26
• Topper — 2020-12-25
• What prevents a coffee cup from spilling — 2020-09-07
• Ceiling — 2020-06-13
• Part of the eye that a fish doesn't have — 2019-07-03
• Jack-in-the-box part — 2019-01-27
• Slang for a hat — 2018-07-17
• Pot part — 2018-06-14
• Aid in keeping food fresh — 2018-05-26
• Hat, informally — 2018-05-06
• Pot's cover — 2018-02-05
• Tupperware feature — 2018-01-21
• Hat, informally — 2017-09-13
• Jar top — 2017-07-05
• Tupperware top — 2017-07-03
• Tupperware topper — 2017-04-05
• Top — 2016-09-17
• Cap — 2016-05-19
• Cornea cover — 2015-05-18
• Hat, informally — 2015-04-12
• Cap — 2015-01-25
• Hat, slangily — 2014-04-25
• Lash holder — 2014-02-23
• Flat top — 2013-10-05
• Pot top — 2013-09-17
• Tupperware piece — 2013-06-25
• Cap — 2011-11-20
• Operculum — 2011-01-08
• Hamper part — 2010-12-11
• Topper — 2010-05-28
• Ceiling — 2010-02-07
• Upper limit — 2009-06-28
• Eye protector — 2008-09-24
• Top — 2008-08-03