overhaul

[v. oh-ver-hawl, oh-ver-hawl; n. oh-ver-hawl]
verb (used with object)
1.
to make necessary repairs on; restore to serviceable condition: My car was overhauled by an expert mechanic.
2.
to investigate or examine thoroughly for repair or revision: Next year we're going to overhaul the curriculum.
3.
to gain upon, catch up with, or overtake, as in a race.
4.
to haul or turn over for examination.
5.
Nautical.
a.
to slacken (a rope) by hauling in the opposite direction to that in which the rope was drawn taut.
b.
to release the blocks of (a tackle).
noun
6.
Also, overhauling. a general examination and repair: The state roads were badly in need of a major overhaul.

Origin:
1620–30; over- + haul

overhauler, noun
unoverhauled, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
overhaul
 
vb
1.  to examine carefully for faults, necessary repairs, etc
2.  to make repairs or adjustments to (a car, machine, etc)
3.  to overtake
 
n
4.  a thorough examination and repair

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

overhaul
1626, from over + haul (q.v.), originally nautical, "pull rigging apart for examination," which was done by slackening the rope by pulling in the opposite direction to that in which it is pulled in hoisting. The noun is attested from 1826. Replaced overhale in sense of "overtake" (1793).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences for overhauling
Submerged speed and endurance was limited and not suited for overhauling many ships.
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