slip a cog
Also, slip a gear or one's gears. Lose one's ability to reason soundly or make correct judgments, as in She must have slipped a cog or she would never have gone out barefoot in December, or What's the matter with him? Has he slipped his gears? These slangy usages allude to a mechanical failure owing to the cog of a gear or a gear failing to mesh. The first dates from about 1930, the variant from the 1960s.
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Example sentences from the Web for slip a cog
ROME — What does it take for a Hollywood A-lister to get a private audience with Pope Francis?Pope Francis Has the Pleasure of Meeting Angelina Jolie for a Few Seconds|Barbie Latza Nadeau|January 8, 2015|DAILY BEAST
Yes, Byrd—dead four-and-a-half years now—was a Kleagle in the Ku Klux Klan.Steve Scalise and the Right’s Ridiculous Racial Blame Game|Michael Tomasky|January 2, 2015|DAILY BEAST
Block 3F is slated for release in 2019, but who knows how much that will slip?New U.S. Stealth Jet Can’t Fire Its Gun Until 2019|Dave Majumdar|December 31, 2014|DAILY BEAST
By the time it concluded with a sing-a-long of “XO,” Beyoncé had done the rare thing.Bow Down, Bitches: How Beyoncé Turned an Elevator Brawl Into a Perfect Year|Kevin Fallon|December 31, 2014|DAILY BEAST
In another year, stories about the strange new face of an A-list actress might draw chortles and cackles.Renée Zellweger Got a New Face—and Everyone Had An Opinion About It|Kevin O’Keeffe|December 29, 2014|DAILY BEAST
Now-a-days it is the bankrupt who flouts, and his too confiding creditors who are jeered and laughed at.Glances at Europe|Horace Greeley
Q was a Queen, who wore a silk slip; R was a Robber, and wanted a whip.
He felt himself the meanest, vilest thing a-crawl upon this sinful earth, and she—dear God!St. Martin's Summer|Rafael Sabatini
All that scientific bric-a-brac in the cupboard had far better be thrown away.The Salvaging Of Civilisation|H. G. (Herbert George) Wells
So my mother begged me to slip into the Rooms, with what was left, and try to get something back.Rosemary in Search of a Father|C. N. Williamson