IPA: /ˈoʊvərˌdraɪv/
KK: /ˈoʊvərˌdraɪv/
A mechanism in a vehicle that allows it to run more efficiently at high speeds by reducing engine power needed for maintaining speed, or a state of increased activity or focus.
During the final weeks of the project, the team shifted into overdrive to meet the deadline.
To operate a vehicle or machine at a higher speed or power than normal, often leading to excessive strain or effort.
He decided to overdrive his car to reach the destination faster.
Past: overdrove
Past Participle: overdriven
Overdrive is formed from "over-" (meaning excessively or beyond) and "drive" (from Old English "drīfan", meaning to force or urge forward). The word describes a state of driving or operating at an excessive level or speed.
Think of going 'beyond' ('over-') the normal level of 'driving' — that's why overdrive means to operate at an excessive speed.
No commonly confused words.