The idiom "deja vu" means a feeling of familiarity with something that is experienced for the first time or something that has already been experienced, but seems to be happening again as if for the first time.

The idiom "couldn’t care less" means to be completely uninterested or indifferent towards something. It is a strong expression of disinterest, indicating that the speaker could not care less about the topic at hand.

"Leg it" is an idiomatic expression that means to run away or flee from something, usually a difficult situation or a person who poses a threat. The phrase can also imply abandoning one's responsibilities or duties.

The idiom "viper in the bosom" refers to a person or thing that appears harmless or trustworthy but is secretly dangerous, treacherous, or deceitful. It suggests that the person or thing is hiding something harmful or harmful intent and can strike at any time without warning.

The idiom "from cradle to grave" means from birth until death, or the entirety of a person's life. It is often used to refer to a situation that persists throughout someone's entire life, or to describe something that has been a part of a person's life since they were born.