(computing) Having two operating systems available, such that either of them can be selected each time the computer is booted.

plural of boot disk

(aviation) An inflatable rubber membrane attached to aircraft surfaces to permit mechanical deicing in flight.

(intransitive, slang, idiomatic) To kick a fallen opponent. / (intransitive, slang, figuratively) To kick someone when they are down.

A type of boot designed to be worn by soldiers during actual combat or combat training

(UK, colloquial) Dressed smartly.

A fashionable boot with very thick soles and heels to make the wearer appear taller.

A type of combat boot used by paratroopers assigned to parachute units, designed to be fully laced and to give extra support to the ankle.

A military boot worn by soldiers serving on tanks and tracked vehicles, fastened with straps instead of laces.

(informal) A highly insulated boot used by the military in cold environments.