What is the origin of the idiom at wits end?

What does et vous deux mean in french? What does it mean when someone says theyre going to five star you? Is it proper etiquette to add the name of the person's company after the individual's name in the cc of a business letter? How can you use the word mustn't in a sentence? What can a women wear for a semi formal event other than a dress? What is niece and nephew in french? How were women expected to beahave in the 1950s? What is 'pour femme' when translated from French to English? What does Idiom A third wheel mean? What does giving due respect mean? How do you use flounced in a sentence? Why was it important for Cleopas and his companion to press their invitation? What does own this mean? Do you put a period after Ms or Mr. or and Mrs? How do you say im good and you in french? What does cava bien merci et toi? How do you write Dr. in a salutation? What is the correct way to write March 13 1952? What does it mean to anger someone? Is more respectfully and adverbs?