What are the Importance of idiomatic expression?

Is an engagement ring considered a gift in New York and should it be returned if the man ends the relationship? How come a guy hung with you for weeks and said he liked you and always called to say he was coming over and then never showed up and never called again and didn't answer when you called? When people call someone Machiavellian they usually mean that person is? How do say Highness in french? Why do waiters wear ties? Use the word dignified in a sentence? What are different kinds of nicknames? How do you say may I enter in french? What is the perssonal pronoun? What does it mean to 5-star someone? Is it weird for a guy to seduce a girl under a table by rubbing his foot against her leg? Why should you support your coworkers? What does ivette mean? What does coquettishly mean? How do you deal with disagreement between practitioner and other adults? What does no me dejes por favor mean in English? What side are buttons on a woman's blouse? How many people cross there legs? What does blue suede shoes symbolize for roger in thank you ma'am? What does this idiom mean 'give him an inch and he'll take a mile'?