What is the meaning of overhaul?

noun

• Periodic maintenance on a car or machine.
  • usage: "it was time for an overhaul on the tractor"
  • synonyms: inspection and repair, service
• The act of improving by renewing and restoring.
  • usage: "they are pursuing a general program of renovation to the entire property"; "a major overhal of the healthcare system was proposed"
  • synonyms: renovation, redevelopment

verb

• Travel past.
  • usage: "The sports car passed all the trucks"
  • synonyms: pass, overtake
• Make repairs, renovations, revisions or adjustments to.
  • usage: "You should overhaul your car engine"; "overhaul the health care system"
  • synonyms: modernize, modernise