space² (also space out) verb

1. [transitive always + adverb/preposition] to arrange objects or events so that they have equal spaces or periods of time between them:
They used three microphones spaced several yards apart.
Try to space out your classes and study in between.
be evenly spaced (=with equal spaces)
For security, use three evenly spaced bolts per post.

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.
⇒ spaced out

[TahlilGaran] Dictionary of Contemporary English ▲