Kickbacks

The dividers between lanes; so called because pins often kick back off a divider to knock other pins
Found on http://www.superglossary.com/Glossary/Entertainment/Bowling/

Kickbacks

Vertical division between lanes at the pit end. On many hits the pins bounce from the kickback knocking additional pins down. (sideboards)
Found on http://www.bowlersparadise.com/help/glossary.shtml
No exact match found