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space2 also space out
1 [transitive always + adverb/preposition] to arrange objects or events so that they have equal spaces or periods of time between them :
Try to space out your classes and study in between.
Try to space out your classes and study in between.2 [intransitive] informal to stop paying attention and just look in front of you without thinking, especially because you are bored or have taken drugs :
I completely spaced out during the lecture.
I completely spaced out during the lecture.