The origin of the idiom "dangerous ground" is not attributed to a specific historical event or source. Instead, it has likely evolved over time as a figurative expression to describe situations or areas that pose risks, challenges, or potential difficulties.  It is used to describe a situation or topic that is fraught with risks, potential problems, or controversy. When you use this idiom, you are highlighting that the situation in question may lead to difficulties, conflict, or negative consequences. It's typically employed to advise caution or to acknowledge that one is treading into a potentially problematic area.

英語での「dangerous ground」の定義と意味

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