Definition of dividing line
: a line or object that separates two areas
The dividing lines on the street were newly painted. A fence marked the dividing line between the two properties.
—often used figuratively the dividing line between right and wrong
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“Dividing line.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/dividing%20line. Accessed 23 Jan. 2022.
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