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po- (Prefix) "away," "off"
Already fossilized as early as Proto-Italic as po- in words like poner. From Proto-Indo-European *h2p-o 'id.' From the full grade *h2epo "away" (see ab-)
Indo-European
Germanic
Old High German fane "from," Old Frisian fan 'id.,' Old Saxon fan 'id.'
Albanian
Albanian pa "without"
Balto-Slavic
Old Church Slavonic po "after," "by," Russian po 'id.,' Czech po 'id.,' Bulgarian po 'id.' Lithuanian po-, a perfective-forming prefix