going shopping; shopping trip
Refers to the act of going out to buy things, often for daily needs or a specific purpose. Can be used as a noun or with する to mean 'go shopping'.
We went shopping as a family on the weekend.
I'll go out and shop for tonight's ingredients.
bulk buying; stocking up
Emphasizes buying in large quantities, often for a business, event, or to stock up. Can imply wholesale purchasing.
We bought drinks in bulk for the event.
I stock up on preserved food in case of a disaster.
Before the party, I went to the supermarket to stock up on supplies.
We split up the shopping for the camping trip among everyone.
Before the typhoon, I bought a large amount of water and food.