Definition of space out phrasal verb from the Oxford Advanced Learner's Dictionary

 

space out

 phrasal verb
phrasal verb
 
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Phrasal Verbs
(informal, especially North American English) to take no notice of what is happening around you, especially as a result of taking drugs I can't remember what happened next—I was totally spacing out. see also spaced out
to arrange things with a wide space between them The houses are spaced out in this area of town. Mothers were being advised to try to space out their pregnancies.
See the Oxford Advanced American Dictionary entry: space out