Answer: blindside

AnswerCrossword Clue
BLINDSIDEVulnerable spot
BLINDSIDEHit from behind, say
BLINDSIDEHit, seemingly from nowhere
BLINDSIDECatch unawares
BLINDSIDE2006 Michael Lewis book subtitled "Evolution of a Game," with "The"
blindsideto hit unexpectedly; to surprise unpleasantly