mind-wandering

noun
UK /ˈmaɪnd ˌwɒn.dər.ɪŋ/
US /ˈmaɪnd ˌwɑːn.dɚ.ɪŋ/

When your thoughts drift away from what you are doing.

Mind-wandering during class made it hard for him to remember the homework.


OTHER MEANINGS

2. A brief shift of attention away from a task toward unrelated thoughts.

Researchers measured mind-wandering by asking people what they were thinking about.

3. The habit of letting your imagination roam instead of paying attention.

Her mind-wandering turned a dull bus ride into a story about dragons.

4. A moment when you lose track of what is happening around you.

A sudden noise ended his mind-wandering and he looked up.