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spacewalk

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

An Americanism dating back to 1960–65; space + walk
Related formsspace·walk·er, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for spacewalk

spacewalk

noun
  1. the act or an instance of floating and manoeuvring in space, outside but attached by a lifeline to a spacecraftTechnical name: extravehicular activity
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verb
  1. (intr) to float and manoeuvre in space while outside but attached to a spacecraft
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012