bench (n.) Look up bench at Dictionary.com
Old English benc "long seat," from Proto-Germanic *bankiz "bank of earth," perhaps here "man-made earthwork," later "bench, table" (source also of Old Frisian bank "bench," Old Norse bekkr, Danish bænk, Middle Dutch banc, Old High German banch), from PIE root *bheg- "to break." Used for "office of a judge" since late 13c. Sporting sense "reserve of players" (in baseball, North American football, etc.) is by 1909, from literal sense of place where players sit when not in action (by 1889).