boundary line

noun
1.
boundary ( def 1 ).

Origin:
1695–1705

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Third, the clearest boundary line involves the need to maintain an atmosphere
  in which critical inquiry is possible.
Heat-sensing cameras are pointed at the batsman from the boundary line.
In news, there is no boundary line between your subject and usually no referee.
It has a way of clarifying the pasture, creating a sharper boundary line.
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