ступить

• IPA^(key):

Inherited from Old East Slavic ступити (stupiti), from Proto-Slavic *stǫpiti, from Proto-Indo-European *stab- (“to support”).

Compare Upper Sorbian stupić, Polish stąpić, Czech stoupit, Serbo-Croatian stupiti.

ступи́ть • (stupítʹ) pf (imperfective ступа́ть)

1. to tread, to step on

   ступи́ть на зе́млю ― stupítʹ na zémlju ― to set foot on land

• Vasmer, Max (1964–1973) “ступать”, in Oleg Trubachyov, transl., Этимологический словарь русского языка [Etymological Dictionary of the Russian Language] (in Russian), Moscow: Progress
• Vasmer, Max (1964–1973) “ступень”, in Oleg Trubachyov, transl., Этимологический словарь русского языка [Etymological Dictionary of the Russian Language] (in Russian), Moscow: Progress
• Vasmer, Max (1964–1973) “степень”, in Oleg Trubachyov, transl., Этимологический словарь русского языка [Etymological Dictionary of the Russian Language] (in Russian), Moscow: Progress
• Vasmer, Max (1964–1973) “стопа”, in Oleg Trubachyov, transl., Этимологический словарь русского языка [Etymological Dictionary of the Russian Language] (in Russian), Moscow: Progress

с- (s-) +‎ тупи́ть (tupítʹ)

ступи́ть • (stupítʹ) pf (imperfective тупи́ть)

1. to blunt, to make dull

• пусти́ть (pustítʹ)