Meaning

noun the posterior part of a human (or animal) body from the neck to the end of the spine

noun the side that goes last or is not normally seen

noun the part of something that is furthest from the normal viewer

originEtymology tree Proto-Indo-European *bʰeg-der.? Proto-Germanic *baką Proto-West Germanic *bak Old English bæc Middle English bak English back From Middle English bak, from Old English bæc, from Proto-West Germanic *bak, from Proto-Germanic *baką, possibly from Proto-Indo-European *bʰeg- (“to bend”). The adverb represents an aphetic form of aback. Compare Middle Low German bak (“back”), from Old…

Etymology from Wiktionary, CC BY-SA 3.0