впопа́д (Russian) comes from Russian попасть, from Russian па́сть, from Proto-Slavic pastь, from Proto-Slavic pastì, from Proto-Balto-Slavic pṓˀstei, from Proto-Indo-European pēd-, from Proto-Indo-European ped- — to walk, to step; to stumble, to fall.
впопа́д (Russian): apropos, to the point, to the purpose, opportunely
Definitions
apropos, to the point, to the purpose, opportunely
Ancestry of “впопа́д”, step by step
впопа́д traces back through two separate lines of ancestry.