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The origin of this idiom can be traced back to the 19th century and likely originates from the world of fashion. It was originally used to describe someone who is dressed in a manner that is attention-grabbing, stylish, and striking. The term "to kill" in this context is associated with the idea of being so well-dressed that it can figuratively "kill" or captivate others with one's appearance. Today, it is commonly used to describe someone who is impeccably dressed or wearing attire that is particularly fashionable, sophisticated, or eye-catching, often in formal or special occasions.

The origin of the phrase "get on one's nerve" can be traced back to the late 19th century. The word "nerve" in this context refers to one's sensitivity or emotional state. The phrase likely emerged from the idea that persistent or irritating stimuli could affect one's nerves, causing discomfort or annoyance. This idiom is commonly employed in interpersonal relationships, such as with family members, friends, or colleagues, to express exasperation or frustration with someone's behavior, habits, or actions that continually test one's patience or sensitivity.

The origin of the idiom "go to town" dates back to the early 19th century and has its roots in American English. The exact origin is unclear, but it likely emerged from the idea of going to a town or city to engage in various activities or take advantage of the amenities and opportunities available there. It can be used in professional settings, such as encouraging a colleague to go to town on a project, meaning to put in maximum effort and attention to detail.

The idiom "fall through the cracks" is a metaphorical expression that originated from the idea of something slipping or dropping through the gaps or openings in a structure, much like an object falling through the gaps between floorboards or the cracks in a pavement. In a figurative sense, it came to be used to describe situations where individuals or things are overlooked or neglected within a system, process, or set of rules. The phrase is used to convey the idea that despite efforts to create a comprehensive or foolproof system, there are inherent flaws or oversights that allow some elements to escape notice or attention.