Smersh Syllabification: (Smersh)Pronunciation: /smərSH/Definition of Smersh the popular name for the Russian counterespionage organization responsible for maintaining security within the Soviet armed and intelligence services. Origin:abbreviation of Russian Smertʹ shpionam, literally 'death to spies'Smersh in other Oxford dictionaries Definition of Smersh in the British & World English dictionary