knifeboard

Noun

 * 1) A board on which knives are cleaned or polished.
 * 2)  A way of arranging benches back to back, resembling a knifeboard; common on the open upper deck of early double-deck omnibuses and trams.
 * knifeboard seating
 * 1) * Arthur Smith, A Summer Idyll
 * On 'busses' knifeboards stretch'd, / The City clerks all tongue-protruded lay.
 * 1)  An early bus with narrow, restrictive seating; a knifeboard bus.