A straddle is any set of offsetting positions on personal property. One example, is a put and call option on the same number of shares of a particular security, with the same exercise price and expiration date.
Definition of flack for English Language Learners. : a person whose job is to make people like or be interested in someone or something.
quack - an untrained person who pretends to be a physician and who dispenses medical advice. 1  doc, doctor, physician, Dr., MD, medico - a licensed medical practitioner; I felt so bad I went to see my doctor. 2  charlatan, mountebank - a flamboyant deceiver; one who attracts customers with tricks or jokes.