Space walk

spacewalk

[speys-wawk]
noun
1.
a task or mission performed by an astronaut outside a spacecraft in space.
verb (used without object)
2.
to execute such a task or mission.

Origin:
1960–65, Americanism; space + walk

spacewalker, noun
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World English Dictionary
spacewalk (ˈspeɪsˌwɔːk)
 
n
1.  Technical name: extravehicular activity the act or an instance of floating and manoeuvring in space, outside but attached by a lifeline to a spacecraft
 
vb
2.  (intr) to float and manoeuvre in space while outside but attached to a spacecraft

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