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The idiom "answer the call of nature" is used to refer to the instinctual need to attend to biological functions, such as using the restroom, due to the body's natural urges. The idiom originated from the idea that nature itself "calls" a person to respond to these bodily needs, and one must heed this call promptly.

The idiom "cut the cheese" is used as a humorous and informal way to describe the act of passing gas. The origin of this phrase is somewhat unclear, but it is thought to have developed as a playful expression to discuss an otherwise socially awkward or embarrassing bodily function. The use of "cut" implies the release of gas, and "cheese" might be a reference to the odor associated with flatulence, likening it to the smell of cheese.

The idiom "pit stop" finds its origin in the world of motorsports, particularly in the context of car racing. During a race, drivers make "pit stops" to refuel, change tires, make necessary repairs, and perform quick maintenance on their vehicles. These stops are essential for the driver's performance and the car's overall functionality. Over time, the term has been adopted into everyday language to describe any brief stop made during a journey, whether for refueling, eating, using a restroom, or getting some rest.

The idiom "take a leak" is an informal expression used to describe the act of urinating. It is a way of discussing a natural bodily function. The term "leak" suggests the release of liquid, in this case, urine. While the exact origin of the phrase is not well-documented, it is thought to have evolved as a lighthearted and discreet way to reference the need to urinate without being overly explicit.

The idiom "hold one's water" is believed to have originated from a time when people had to physically carry or transport water from a source to their homes. This expression has since evolved to describe the act of resisting the urge to urinate, typically due to a lack of immediate restroom facilities.