Definition of space verb from the Oxford Advanced Learner's Dictionary
[often passive]space something (+ adverb/preposition)to arrange things so that they have regular spaces between themevenly spaced plantsa row of closely spaced dotsSpace the posts about a metre apart.
(informal, especially North American English) to take no notice of what is happening around you, especially as a result of taking drugsI can't remember what happened next—I was totally spacing out. see also spaced out
space something out
to arrange things with a wide space between themThe houses are spaced out in this area of town.Mothers were being advised to try to space out their pregnancies.