Etymology
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moonwalk (n.)

1966, "a walking on the moon," from moon (n.) + walk (n.). As a dance move in which the dancer  moves backward while appearing to walk forward it was popularized 1983 by Michael Jackson. 

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Definitions of moonwalk

moonwalk (n.)
a kind of dance step in which the dancer seems to be sliding on the spot;
Michael Jackson perfected the moonwalk in the 1980s
moonwalk (n.)
an exploratory walk by an astronaut on the surface of the moon;
From wordnet.princeton.edu