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The idiom "bright spark" is believed to have originated in British English. The phrase likely emerged from the imagery of a spark representing intelligence or brilliance, combined with the adjective "bright" to emphasize the person's intellectual abilities. It is a metaphorical expression that conveys the idea of someone shining intellectually or having a quick, sharp mind. Over time, the phrase has become a commonly used idiom to commend or recognize someone's intelligence or cleverness.

The origin of the idiom "pick one's brain" likely draws on the metaphorical idea of the human brain as a valuable resource containing knowledge and insights. The word "pick" in this context suggests the act of selectively extracting or gathering information, similar to picking individual items from a collection. Over the years, the phrase has become a widely recognized phrase that is used to describe the act of seeking advice, information, or expertise from someone by engaging in a conversation or discussion.

The origin of the idiom "rack one's brain" is believed to be derived from the medieval torture device known as the "rack." The rack was a mechanical contraption used to stretch or torture individuals by applying extreme tension to their bodies. The phrase represents the mental strain and anguish that one experiences when trying to recall or solve something difficult, similar to the physical agony inflicted by the rack. It is commonly used when someone is faced with a challenging problem, a difficult riddle, or the need to recall specific information from memory.

A gutter is a long, narrow channel, usually made of metal, plastic, or other materials, that is attached along the edge of a roof. Its main purpose is to collect and carry away rainwater that flows off the roof, directing it away from the walls and foundation of a building. This helps prevent water from causing damage to the structure, such as eroding the foundation, staining the walls, or flooding the surrounding area. Gutters are commonly connected to downspouts, which lead the water down to the ground or a drainage system.

The origin of the idiomatic expression "lend a hand" can be traced back to the literal act of physically assisting someone by extending a hand to offer support. It has likely emerged from the universal understanding of reaching out and offering help to those in need. Over time, this idiom have become deeply ingrained in language and culture, emphasizing the importance of being helpful, supportive, and compassionate towards others.