1to be mobile (e.g. after an illness)
2to visit one another; to socialize
3to pay a visit (go to the toilet)
4to walk around; to move about; to stretch one's legs; to go for a walk
Example
tā她bìng病le了hěn很jiǔ久，xiàn zài现在hái还hěn很xū ruò虚弱，wú fǎ无法suí yì随意zǒu dòng走动。
她病了很久，现在还很虚弱，无法随意走动。
She has been ill for a long time and she is still too weak to get about.