space out

space out
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

●ˌspace ˈout(informal, especially NAmE) to take no notice of what is happening around you, especially as a result of taking drugs 精神恍惚，神志迷糊（常因吸毒）  ➡  see also spaced out