1. to talk or complain in a rambling, unfocused way; to grumble without clear purpose
Usage: often used with 'about' or 'on'
2. to move or wander aimlessly; to meander
Usage: less common than sense 1

Examples

• He maundered on about his complaints for hours without making a clear point.
• She tends to maunder about the weather whenever she's bored.
• The old man maundered through the park, lost in thought.
• Stop maundering and get to the point!
• They maundered about the neighborhood on a lazy Sunday afternoon.
• He maundered through his speech, jumping from topic to topic.
• The customer maundered at the service desk about various grievances.