(rare) To shift gears.

An automatic transmission with separate clutches for odd and even gears.

A twin-clutch gearbox

(automotive) A type of manual gearbox which can be designed with either a manual or fully-automated clutch system. Gear shifts by the driver can only be chosen in a successive order, and the driver cannot skip gears, like with a standard H-pattern manual transmission. This type of transmission is most commonly used in motorcycles and racecars, and is a form of manual motorcycle transmission.

A military body charged with police duties among the civilian population.

The ratio of the speeds of rotation of the initial and final gears in a gear train.

Alternative spelling of Secretary General

The chief administrator of an international body such as NATO or the United Nations. / The secretary of a political party or other NGO in many countries.

(Britain) The lever used to change gears in a motor car.

plural of Geiger counter