
einkaufen
to shop
To buy everyday goods, especially groceries, in stores.
Freitagnachmittag gehe ich immer für das Wochenende einkaufen.
On Friday afternoons, I always go shopping for the weekend.
to shop
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to shop
To buy everyday goods, especially groceries, in stores.
Freitagnachmittag gehe ich immer für das Wochenende einkaufen.
On Friday afternoons, I always go shopping for the weekend.

to buy into
To acquire a share or position in a company, organization, or project through a financial investment.
Um Partner zu werden, musste er sich mit einer hohen Summe in die Kanzlei einkaufen.
To become a partner, he had to buy into the law firm with a large sum of money.
'Einkaufen' (to shop) is a separable verb. The prefix 'ein-' comes at the end in a main clause. In subordinate clauses and in the infinitive with 'zu', the verb stays together.
Ich kaufe schnell für das Abendessen ein.
I'll quickly shop for dinner.
'Einkaufen' (to shop) is often used without a direct object to describe the general activity of shopping. A very common combination is 'einkaufen gehen' (to go shopping).
Am Samstagvormittag gehen viele Leute einkaufen.
Many people go shopping on Saturday mornings.
This special meaning has a fixed grammatical structure: 'sich in etwas (Akkusativ) einkaufen' (to buy into something). Here the verb is always reflexive.
Der Investor wollte sich in den erfolgreichen Fußballverein einkaufen.
The investor wanted to buy into the successful football club.
This meaning of 'einkaufen' (to buy into) is used almost exclusively in an economic or business context. It is about becoming part of something through money.
Sie hat sich in die Anwaltskanzlei eingekauft und ist jetzt Partnerin.
She bought into the law firm and is now a partner.
to buy
Kaufen usually focuses on a specific item acquired in exchange for money. Einkaufen refers more to the overall activity of getting groceries or other everyday necessities. So kaufen is appropriate for individual products, while einkaufen refers to shopping as an activity.

Mia kauft im Supermarkt für die ganze Woche ein.
Mia does the grocery shopping for the whole week at the supermarket.
Mia kauft im Supermarkt eine Packung Reis.
Mia buys a packet of rice at the supermarket.