Cosmonaut Alexei Leonov was the first person to conduct an extravehicular activity (EVA), (commonly called a "spacewalk"), on 18 March 1965, on the Soviet Union's Voskhod 2 mission.
kˈɑːzmənˌɔːt ɐlˈɛkseɪ lˈiənɑːv wʌzðə fˈɜːst pˈɜːsən tə kəndˈʌkt ɐn ˌɛkstɹəvɪhˈɪkjʊlɚɹ æktˈɪvᵻɾi ˈiːvə, kˈɑːmənli kˈɔːld ˈeɪ "spˈeɪswɔːk", ˌɔn ˈeɪtiːn mˈɑːɹtʃ nˈaɪntiːnhˈʌndɹɪd sˈɪksti fˈaɪv, ɔnðə sˈoʊviət jˈuːniənz vˈɑːskhɑːd tˈuː mˈɪʃən.