Etymology
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auger (n.)

"instrument for boring larger holes," c. 1500, faulty separation of Middle English a nauger, from Old English nafogar "nave (of a wheel) drill," from Proto-Germanic *nabo-gaizaz (source also of Old Norse nafarr, Old Saxon nabuger, Old High German nabuger), a compound whose first element is related to nave (n.2) and whose second is identical to Old English gar "a spear, borer" (see gar). For other similar misdivisions, see adder. The same change took place in Dutch (avegaar, egger).

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Definitions of auger

auger (n.)
a long flexible steel coil for dislodging stoppages in curved pipes;
Synonyms: plumber's snake / snake
auger (n.)
hand tool for boring holes;
Synonyms: gimlet / screw auger / wimble
From wordnet.princeton.edu