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The origin of the idiom "battle line" can be traced back to military tactics and strategies employed in ancient warfare. The concept of organizing forces in a linear formation can be found in various historical periods and civilizations, including ancient Greece, Rome, and medieval Europe. The specific term "battle line" itself emerged as a descriptor for the position or alignment of troops facing the enemy during conflicts. Over time, the term has been adopted and adapted in different contexts beyond its military origins to represent divisions or confrontations in various arenas, such as politics, sports, or even metaphorical battles of ideas.

The phrase "beard the lion in his den" originated from Shakespeare's play "Richard III" and refers to the act of confronting a powerful opponent or authority figure in their own territory or domain. It symbolizes the courage to face a formidable challenge or danger head-on. It is commonly employed in situations involving challenging authority figures, taking on formidable opponents, or standing up to influential individuals in their own stronghold.

The idiom "bite one's tongue" has its origins in the English language and dates back to at least the 16th century. The expression alludes to the literal act of biting down on one's own tongue to prevent oneself from speaking. It is commonly employed when someone wants to refrain from speaking their mind, opinions, or criticisms in order to maintain peace, avoid conflicts, or prevent hurting others' feelings.

The idiom "come off it" is an informal expression that is used to indicate skepticism or disbelief when someone makes statements or claims that are considered unrealistic or insincere. While the precise historical origin of the phrase is not documented, it has been in use in everyday language for many years. This expression is used to express skepticism or disbelief when someone is making statements or claims that are considered unrealistic, exaggerated, or insincere.

Its origin can be traced back to the 16th century, where the phrase "come out uppermost" was used with a similar meaning. The expression "top" has long been associated with success and victory, and is commonly used in sports to refer to the highest score or the ultimate goal. Over time, the phrase "come out on top" became a popular idiom used in various contexts.