space out
phrasal verbspace out 
- (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.
 
 
space something  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.
 - The fruits should be well spaced out so that they are not touching each other.