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The idiom "every Tom, Dick, and Harry" is an idiom that has been used in English since at least the 17th century. It is a way of referring to random or ordinary individuals without specifying their actual names. Tom, Dick, and Harry are common given names, and the phrase suggests that it includes everyone, regardless of their identity. People often use this phrase to describe a situation where many people, often of little significance, are involved or to express a sense of generality.

The idiom "jack of all trades" likely has its origins in medieval Europe. It was originally used to describe a person who had a broad range of skills and abilities but may not have been a master or expert in any one particular trade or profession. The term "jack" was a generic name for a man, similar to "John" or "Joe," and it was used to refer to someone who was versatile in various trades. The idiom "jack of all trades" is used to describe a person who has a wide range of skills or abilities, often in different areas of work or expertise. It implies that the person is versatile and can handle a variety of tasks or roles but may not be a specialist or expert in any single field. It can be used both positively, to acknowledge someone's versatility, and sometimes negatively, to suggest a lack of expertise or depth in a specific area.

The origin of the phrase "slip someone a Mickey" can be traced back to the early 20th century in the United States. It is thought to be derived from the name of a person who was notorious for drugging unsuspecting individuals. Over time, the phrase became more widely used to describe the act of secretly administering a drug to someone with the intent of incapacitating or sedating them. It is important to note that the phrase may carry negative connotations due to the unethical and potentially illegal nature of drugging someone without their consent.

The idiom "have something down pat" suggests that someone has mastered a skill, task, or knowledge to the point of being able to perform it perfectly and effortlessly. It originates from the idea of having a pattern or process down so well that it feels like it's been imprinted or memorized, akin to having it "pat" or perfectly mastered. This phrase is commonly used to indicate a high level of proficiency or expertise in a particular area, emphasizing that the person is highly skilled and knowledgeable about the subject or task at hand.

The idiom "rob Peter to pay Paul" originated from the historical practice of taking funds from one church (dedicated to Saint Peter) to support another (dedicated to Saint Paul). The idiom is now used to describe a situation where someone attempts to solve a financial problem or debt by borrowing or taking from one source, but this action may create a new problem or debt elsewhere. It highlights the short-term nature of such solutions and the potential for unintended consequences.

The use of "roger" as an interjection has its origin in radio communication and military jargon where it is used to acknowledge that a message has been received and understood. In more casual and everyday language, the use of "roger" has extended beyond its original radio communication context. It is sometimes used informally as a way of expressing agreement or acknowledgment in a similar manner to saying "got it" or "acknowledged."

The idiom "Doubting Thomas" has its roots in the Christian Bible, specifically in the New Testament. This phrase is used to describe a person who is hesitant to believe something, especially if it seems extraordinary or implausible, without sufficient evidence or verification.