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The idiom "clear the decks" means to remove all obstacles or difficulties, usually before a major event takes place. It can also mean to get rid of unnecessary people or things. The figurative meaning is that it is necessary to prepare for something important by removing any potential obstacles or distractions.
The origin of the idiom "clear the decks" is not entirely clear, but it has been used in English since at least the 17th century. It may have come from the practice of clearing the deck of cards before playing a game or shuffling them after a round. In this context, "clear the decks" meant to get rid of all the cards and start fresh. Over time, the idiom has taken on a more general meaning and is often used in situations where things need to be cleared away or removed in order for something important to happen. The use of the word "decks" may have been influenced by the nautical term, which refers to the wooden parts of a ship that are located above the waterline and are used for fighting fires or fighting off boarders. In this context, "clear the decks" meant to get rid of anything that could potentially hinder the crew's efforts to protect the ship.