Historical clue formulations

• Many a listing in an etiquette book — 2026-09-12
• It's verboten — 2026-02-22
• Discouraged action — 2026-02-15
• Something you should avoid — 2025-11-15
• Taboo — 2025-08-18
• Don't-do — 2025-02-18
• Bad idea — 2024-09-14
• Baseball pitcher's feat, informally — 2024-08-22
• Something forbidden — 2024-08-05
• Something best avoided — 2024-04-26
• Leaving a participle dangling in English class, say — 2024-01-19
• Using ketchup on a steak at a fancy steakhouse, e.g. — 2023-10-30
• Don't — 2023-07-09
• Running by the pool, e.g. — 2022-09-13
• Giving chocolate to the dog, e.g. — 2022-06-03
• Taboo — 2022-01-26
• You shouldn't do this — 2021-11-26
• Forbidden action — 2021-10-11
• Ill-advised move — 2021-05-16
• Taboo — 2020-12-30
• Faux pas — 2020-06-07
• Eating pizza with a fork and knife, to New Yorkers — 2020-04-28
• It's against the rules — 2020-03-30
• Roller-skating in the house, say — 2020-01-31
• It's verboten — 2019-09-05
• Talking in a movie theater, e.g. — 2019-03-28
• Eating with one's elbows on the table, e.g. — 2018-07-13
• Pitcher's feat, slangily — 2018-04-15
• Off-limits activity — 2017-11-21
• "Don't touch that, honey!" — 2017-05-09
• Texting while driving, e.g. — 2017-02-05
• Wearing red to a Chinese funeral, e.g. — 2016-09-23
• Texting in a theater, e.g. — 2016-08-11
• Taboo thing — 2016-07-25
• Taboo — 2016-06-22
• Taboo — 2016-04-06
• Proscription — 2015-12-31
• Playing with matches, e.g. — 2015-07-28
• Don't do it — 2015-07-19
• "That's a ___" — 2015-05-24
• Talking during a movie, e.g. — 2015-04-05
• Texting while driving, e.g. — 2013-08-18
• Something to avoid — 2013-06-11
• Something you might get your hand slapped for doing — 2013-05-13
• It's taboo — 2012-10-29
• "What were you thinking?!" — 2012-10-02
• It's prohibited — 2011-09-12
• Taboo — 2011-04-19
• It's out of bounds — 2010-11-26
• Burping in public, e.g. — 2010-06-09