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The idiom "not lose sleep over someone or something" means that one is not excessively worried or concerned about a particular person or situation. It implies that one can remain calm and undisturbed, even in the face of potential problems or stressors. The phrase suggests that the matter at hand is not significant enough to keep one awake at night. This expression is often used to convey a sense of emotional detachment or resilience.

The idiom "out of hand" likely has its origins in the idea of something being beyond one's physical control. The expression suggests that a situation has moved quickly or become uncontrollable, much like something slipping "out of hand." Over time, this figurative usage of the phrase evolved to include the notion of acting promptly or without hesitation, without the need for further control or consideration.

The idiom "run roughshod over someone or something" is derived from the literal practice of using horses with "roughshod" hooves. Roughshoeing involved attaching shoes with sharp projections or calkins to a horse's hooves to provide better traction on slippery or uneven surfaces. This allowed the horse to move without regard for obstacles and made it easier for them to traverse challenging terrains. This expression is often used to describe a situation where someone or something dominates or mistreats others in a forceful and disrespectful manner.

The origin of the idiom "give a hoot" is not precisely documented, but it likely developed from the association of owls' hooting sounds with being attentive or vigilant. Owls are known for their distinctive hooting calls, and in various cultures, the sound of an owl hooting is sometimes linked to the idea of being watchful or alert. Over time, this association evolved into the idiom "give a hoot," which is used to express a varying degree of interest, concern, or enthusiasm for something.

The expression "not give a hang" likely originated from the broader usage of "hang" as a term for a minor or insignificant amount, which was commonly used in informal language. In this context, "hang" represents a very small, unimportant quantity. Over time, this expression became an informal way to emphasize the lack of concern or interest in something.

The idiom "look out for number one" advises a person to prioritize their own interests and well-being above all else. It originated in the mid-20th century and is often used in a somewhat self-centered or survivalist context. This expression is used to emphasize the importance of self-preservation and the idea that one should take care of their own needs and concerns first, especially in competitive or challenging situations.