Shuttle meaning : The part of a loom that carries the woof back and forth between the warp threads. The sliding thread holder in a sewing machine, which carries the lower thread through a loop of the upper thread, to make a lock stitch. A transport service (such as a bus or train) that goes back and forth between two places, sometimes more. Such a transport vehicle; a shuttle bus; a space shuttle. Any other item that moves repeatedly back and forth between two positions, possibly transporting something else with it between those points (such as, in chemistry, a molecular shuttle). A shuttlecock. A shutter, as for a channel for molten metal. To go back and forth between two places. To transport by shuttle or by means of a shuttle service.