Definition and background:
Transitional passage connecting two sections of a composition.That part of a stringed instrument which supports the strings. Also [Eng.] bridge; [Fr.] chevalet; [Ger.] Steg; [It.] ponticello; [Sp.] puente.Transitional passage connecting two sections of a composition, also transition. Also the part of a stringed instrument that holds the strings in place and transmits their vibrations to the resonant body of the instrument.
For more information on the music term "Bridge" check out these other resources:
Wikipedia - Glossary of Musical Terminology
Virginia Tech Multimedia Music Dictionary
ORB -- Medieval Music Glossary