The idiom "man's best friend" refers to a dog, which is often considered the most loyal and affectionate companion for humans. It implies that dogs are highly valued by people for their companionship and loyalty.

The idiom "turn the clock back" means to go back to a previous, better or more enjoyable time. It can also refer to reversing a negative situation or undoing a mistake. In a metaphorical sense, it means revisiting a past moment and reliving it, often with nostalgia.

The idiom "sixth sense" refers to an intuitive or extrasensory ability to perceive or know something without the use of any of our five senses (sight, touch, hearing, taste, and smell). It is often used to describe a person who has a talent for predicting events or people's behavior.

The idiom "yes man" refers to someone who always agrees with others, even if they don't necessarily believe what they are saying or if it goes against their personal values or beliefs. The term is often used negatively to describe someone who lacks integrity or independence of thought.

The idiom "John Doe" is used to refer to an unknown person or someone whose identity is not known. It can be used to describe someone who is a stranger, a random person, or someone who is unidentified in a situation.