
kosten
to cost
To have a particular price in money.
Was kostet dieses Buch?
What does this book cost?
to cost / taste
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to cost
To have a particular price in money.
Was kostet dieses Buch?
What does this book cost?

to taste
To try a small amount of a food or drink in order to check the flavor.
Möchtest du mal von der Suppe kosten?
Would you like to taste some of the soup?

to cost
To require a certain amount of effort, exertion, or loss.
Das hat mich viel Zeit und Nerven gekostet.
That cost me a lot of time and nerves.
In the meanings 'einen Preis haben' (to have a price) (m01) and 'Aufwand erfordern' (to require effort) (m03), 'kosten' (to cost) requires two accusative objects: the person (whom?) and the thing (what?). For example: Es kostet mich (accusative) viel Zeit (accusative).
Die Reparatur hat mich fast 100 Euro gekostet.
The repair cost me almost 100 euros.
The meaning 'probieren' (to taste/try) (m02) always refers to food or drink. The other meanings (m01, m03) refer to price or effort and often have a person as an additional accusative object.
Darf ich mal von deinem Eis kosten?
May I taste some of your ice cream?
When trying something to check the flavor, 'kosten' (to taste) is often used with the preposition 'von' (of/from) and the dative. However, it can also be used directly with an accusative object.
Der Koch kostete von der Soße und fügte noch etwas Salz hinzu.
The cook tasted the sauce and added a little more salt.
price / prize
Kosten is a verb and states how much money you have to pay for something. Der Preis is the noun for this amount of money. Use kosten to make a statement about the amount, and der Preis when you name the amount as a thing.

Die neue Kaffeemaschine kostet 120 Euro.
The new coffee machine costs 120 euros.
Der Preis der neuen Kaffeemaschine beträgt 120 Euro.
The price of the new coffee machine is 120 euros.