der Apfelsaft
apple juice
A fruit juice made by pressing apples.
Ich hätte gerne eine Apfelsaftschorle, bitte.
I would like an apple juice spritzer, please.

apple juice
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apple juice
A fruit juice made by pressing apples.
Ich hätte gerne eine Apfelsaftschorle, bitte.
I would like an apple juice spritzer, please.

'Apfelsaft' (apple juice) is a simple compound made up of 'der Apfel' (the apple) and 'der Saft' (the juice). The structure '[fruit] + saft' is very common in German, for example in 'Orangensaft' (orange juice) or 'Kirschsaft' (cherry juice).
Dieser Apfelsaft schmeckt sehr frisch.
This apple juice tastes very fresh.
A very common and popular variation is 'Apfelsaftschorle' (apple juice spritzer). This is apple juice mixed with mineral water, usually sparkling.
Im Sommer trinke ich am liebsten eine kalte Apfelsaftschorle.
In summer, my favorite thing to drink is a cold apple juice spritzer.
When buying or ordering apple juice, the distinction between 'klar' (clear) and 'naturtrüb' (naturally cloudy) is common. Naturally cloudy apple juice still contains fruit pulp and is not filtered.
Ich bevorzuge naturtrüben Apfelsaft, weil er intensiver schmeckt.
I prefer naturally cloudy apple juice because it tastes more intense.
must
'der Most' and 'der Apfelsaft' can both be made from pressed apples. 'Apfelsaft' is the general, clear term for juice from apples, the kind you drink from the supermarket or at home. 'Most' is more specific: it can be freshly pressed juice that is not yet fermented or only partly fermented. In some regions, 'Most' also means an alcoholic drink made from apples or pears. That is why the words can easily be confused. If you simply mean juice to drink, 'Apfelsaft' is usually more natural. 'Most' fits better in contexts such as the harvest, a cider press, or regional drinks.

Zum Frühstück trinkt Lena ein Glas Apfelsaft.
Lena drinks a glass of apple juice for breakfast.
Der Most vom Bauernhof schmeckt noch sehr frisch und leicht sauer.
The must from the farm still tastes very fresh and slightly sour.