counterespionage
1. [ noun ] (military) spying on the spies
Related terms: counterintelligence
Similar spelling:   countersubversion
  counteraction
  counter-sabotage
  countervailing
  counterrevolution
  counterexample
  counterreformation
  counterpoison
  counterperson
  countersignature
  counterpoised
  countermeasure
  counterculture
  countervailing_duty
  counterproposal
  counterattraction