What is the origin of the idiom at wits end?

What does snickering mean? What is the cajun slang word for comotion? Is there a pill to make you more sociable? How do you give vote of thanks? Is the word politeness a common noun or a proper noun? How can infective agents be transmitted to people? In a Formal letter do you write sincerley? Are there different sizes for petite formal dresses? What does the name Evonne mean? What should a woman do if her breasts accidentally show in public? What is the dress code at Dillard's? Is the correct form workmens' or workmn's? What does right fond of mean? What does the french word et toi mean? What is the word for not following authority? What is the purpose of the Japanese tea ceremony? How do you write warning letter to employee for late arrived? What colour shoes to wear with a mustard dress? What is the name of the person who accompanies a woman to protect her virtue when she goes out with a man? What kind of wonen is mrs jones from thank you m'am?