The idiom "around the clock" originated from the concept of measuring time using a clock's circular face. It dates back to the late 19th century, when mechanical clocks became more prevalent and clock faces featured 12-hour or 24-hour markings. This expression is commonly employed in situations that require constant attention, monitoring, or availability.

What is the origin of the idiom "make a go of something" and when to use it?

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Определение и значение слова «around the clock» на английском языке

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