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Definition of Blow a backsight
1. Verb. (surveying) To occupy a point, then enter the wrong point for the backsight, or forget to enter the backsight. ¹
¹ Source: wiktionary.com
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1. Verb. (surveying) To occupy a point, then enter the wrong point for the backsight, or forget to enter the backsight. ¹
¹ Source: wiktionary.com