Definition of overhaul noun from the Oxford Advanced Learner's Dictionary

BrE BrE//ˈəʊvəhɔːl//
; NAmE NAmE//ˈoʊvərhɔːl//
an examination of a machine or system, including doing repairs on it or making changes to it a complete/major overhaul A radical overhaul of the tax system is necessary. See related entries: How machines work
Word Originearly 17th cent. (originally in nautical use in the sense ‘release rope tackle by slackening’): from over- + haul.
See the Oxford Advanced American Dictionary entry: overhaul

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