отбива́ть (Russian) comes from Russian отби́ть, from Russian бить, from Proto-Slavic bìti, from Proto-Balto-Slavic bī́ˀtei, from Proto-Indo-European bʰeyh₂- — to fear, be afraid; to strike, hit; to hew, cut.
отбива́ть (Russian): to beat off (an attack; enemies), to repulse