catflap.org Online Dictionary Query

  defeat sb. with his own arguments /dɪfˈiːt ˌɛsbˈiː wɪð hɪz ˈəʊn ˈɑːɡjuːmənts/
  jdn. mit den eigenen Waffen schlagen [übtr.]
   see: weapon, arm, weapons, arms, biological weapons, service weapon, sidearm, handheld firearms, handheld guns, handguns, one-hand guns, small guns, small firearms, shoulder arms, shoulder weapons, sophisticated weapons, hunting weapon, sporting weapon, small arms, conventional weapons, light weapons, magazine weapons, magazine arms, minor weapons, precision weapons, side arm, tactical weapons, incendiary weapon, fragmentation weapon, be packing, decommission weapons