What is the origin of the idiom at wits end?

What is the meaning of the idiom 'to be tickled pink'? How do you say pardon me in bengali? What the definition of dishonor? Why was a personal appearance important in the samurais code? What does stuff that mean? How do you say stop stalking to me in French? What to use instead of Dear when writing a formal letter? Why Japanese people bow to each other when greet? What is the french word for mess? How do you ask for directons in french? What are three sentences for the word gentleman? A sentence using courteous? Do you hand salute with your hand above your eyebrow or below? What attitude of tassai is admirable? When will you learn your manners? What does it mean to do right by someone? Is politeness and courtesy outdated in today? What if people will make fun of you? Is it bad manners to burp at the table? What does chaperone child mean?