Meaning

noun a raised vertical board with basket attached; used to play basketball

noun a board used to support the back of someone or something

originLikely a borrowing from Dutch bakboord (“portside”) or from Middle Low German backbort, bakbōrt (“portside”). Old English bæcbord (“larboard, portside”) did not survive (in that form) into Middle English; Scottish texts of the 1500s have forms like bawbord, baburd and babord, possibly borrowed from French bâbord; later texts with Scots backburd, backber may have borrowed it from Old Norse…

Etymology from Wiktionary, CC BY-SA 3.0