The idiom "live and breathe" means to devote oneself completely to something or someone, to be totally engrossed in it. It can also mean to exist or survive only through this thing or person.

The idiom "mark my words" is used to express a warning or a statement that will be important later. It means something very serious, especially if it involves legal or financial consequences.

The idiom "class act" is used to describe someone who behaves professionally, graciously, or elegantly in any given situation. It suggests that the person possesses good manners, etiquette, and social skills.

"A drowning man will clutch at a straw" is an idiom that means a person who is in a dire situation and feels like they are on the brink of failure or collapse will desperately cling to any small hope, opportunity, or resource that may help them survive.

The idiom "lily-livered" is used to describe someone who is cowardly, timid, or lacks courage. It can also refer to someone who is dishonest or unreliable. The term is often used in a negative way and suggests that the person being described has a weak character.