Mauritania, on the fifth medal, leads a horse with something like a thread; in her other hand she holds a switch. Addison.

Safety switch (Railways), a form of switch contrived to prevent or lessen the danger of derailment of trains. -- Switch back (Railways), an arrangement of tracks whereby elevations otherwise insurmountable are passed. The track ascends by a series of zigzags, the engine running alternately forward and back, until the summit is reached. -- Switch board (Elec.), a collection of switches in one piece of apparatus, so arranged that a number of circuits may be connected or combined in any desired manner. -- Switch grass. (Bot.) See under Grass.