backsight

== English == === Etymology === From back +‎ sight. === Noun === backsight (plural backsights) The rear sight of a firearm. Synonym: hindsight (rare) Antonym: foresight Holonym: iron sights (surveying) A measurement or reading taken back towards a point of known elevation, used to calculate the height of the surveying instrument (theodolite, transit, total station). (surveying) A measurement of a previously shot point, used to set the angle to zero when occupying a new position. ==== Derived terms ==== blow a backsight ==== Translations ==== === Verb === backsight (third-person singular simple present backsights, present participle backsighting, simple past and past participle backsighted) (surveying) To shoot a backsight. ==== See also ==== foresight hindsight