wander · verb I /ˈwɒn.dər/Full view
wander
B2 to walk around slowly in a relaxed way or without any clear purpose or direction
Dictionary examples:

We spent the morning wandering around the old part of the city.

He was here a moment ago but he's wandered off somewhere.

Learner example:

If you can't afford it you can just wander around the city and enjoy meeting people. (First Certificate in English; B2; Russian)

sb's attention/mind/thoughts, etc. wander
C2 If someone's attention/mind, etc. wanders, they start thinking about one subject when they should be thinking about a different subject.
Dictionary example:

I was bored and my thoughts started to wander.

Learner example:

His mind kept wandering off and he always found himself dreaming of her beautiful blue eyes, her long, dark eye-lashes and her soft, curled hair. (Certificate of Proficiency in English; C2; German)

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