D defs.my
Entry 1 sense Webster, 1913

blindside

/blīn'-dsīdˌ/ · IPA /ˈblaɪndˌsaɪd/
01 v. t. to attack a person from his blind side; metaphorically, to give a person an unpleasant suprise.
  1. 1.
    to attack a person from his blind side; metaphorically, to give a person an unpleasant suprise.