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Definition of overdrive noun from the Oxford Advanced American Dictionary

overdrive

noun
/ˈoʊvərˌdraɪv/ overdrive pronunciation American
[uncountable]
 
an extra high gear in a vehicle, that you use when you are driving at high speeds
to be in overdriveIDIOM

go into overdrive

to start being very active and working very hard
As the wedding approached, the whole family went into overdrive.go into overdrive