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backsight

[ bak-sahyt ]

noun

, Surveying.
  1. a sight on a previously occupied instrument station.
  2. (in leveling) the reading on a rod that is held on a point of known elevation, used in computing the elevation of the instrument.

backsight

/ ˈbækˌsaɪt /

noun

  1. the sight of a rifle nearer the stock
  2. surveying a reading taken looking backwards to a previously occupied station Compare foresight
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word History and Origins

Origin of backsight1

First recorded in 1840–50; back 2 + sight
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Example Sentences

The tiny figures seen over the slide of the backsight seemed a little larger, but also fewer at each successive volley.

"Come quick," he shouted, adjusting the backsight of a rifle.

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backside-toback slang

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