Historical clue formulations

• Sound during a cat fight — 2026-09-24
• Angry cat's "greeting" — 2026-08-09
• Cat's warning — 2026-07-21
• Somewhat audible disparagement — 2025-07-05
• Express disapproval, in a way — 2025-05-23
• Indicator of deflation — 2025-01-25
• Sound from a cappuccino maker — 2024-11-24
• Radiator sound — 2024-10-24
• Whisper menacingly — 2024-09-25
• Steam engine sound — 2024-05-05
• Cassette background noise — 2023-04-27
• Snake's sound — 2023-02-22
• Noise that sounds like its last two letters — 2022-10-14
• Blow off steam, say — 2020-11-29
• Radiator sound — 2020-10-06
• Cat sound — 2020-03-06
• Bad response from an audience — 2019-09-06
• Poor reception? — 2019-04-05
• Sound of contemptuous disapproval — 2019-02-20
• Snake warning — 2019-02-05
• Cottonmouth's warning — 2017-12-31
• Feline's warning — 2017-11-19
• Sibilate — 2017-05-06
• Radiator sound — 2015-12-01
• Blow off steam? — 2015-06-14
• Snake sound — 2015-06-01
• Snake's warning — 2013-12-16
• Kettle sound — 2013-03-07
• Audible reproof — 2012-09-23
• What letting off steam might result in — 2012-04-29
• Unwelcome reception — 2012-03-11
• Snake sound — 2011-12-13
• *Let off some steam? — 2011-06-16
• Snake's sound — 2010-01-11
• Sound of crowd disapproval — 2009-10-12
• Moccasin sound — 2009-01-24
• Cat's warning — 2007-09-16
• Villain's reception — 2007-07-24
• Serpentine sound — 2007-07-23
• Cobra's greeting — 2007-07-05
• Express disapproval — 2006-12-01
• Cat sound — 2005-08-21
• Angry audience reaction — 2005-05-30
• Sign of hostility — 2005-01-22
• Villain's reception — 2004-09-29
• Greeting for a villain — 2004-06-01
• Blow off steam? — 2003-06-06
• Unwarm welcome — 2003-05-11
• Radiator sound — 2002-01-15
• Unwarm welcome — 2001-09-19