double-declutch
verb1
Automotive, Transport, Vehicles Dated A method of changing gear in a vehicle which doesn't have synchromesh. The clutch is depressed to disengage the current gear, released while in neutral, and depressed again to obtain the next gear.
- The Talbot-Darracq, with its leather seats And Biddy in beside me! I could show. Double-declutching to perfection now.1960 [1960], John Betjeman, Summoned by Bells, London: John Murray, page 89: