
naschen
to snack
To eat sweets or other treats, often secretly or between main meals.
Die Kinder dürfen vor dem Abendessen nicht naschen.
The children are not allowed to snack before dinner.
to snack / nibble
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to snack
To eat sweets or other treats, often secretly or between main meals.
Die Kinder dürfen vor dem Abendessen nicht naschen.
The children are not allowed to snack before dinner.

to taste
In a figurative sense, to taste something forbidden or secretly desired, especially in an erotic or romantic context.
Er konnte nicht widerstehen, von der verbotenen Frucht zu naschen.
He could not resist tasting the forbidden fruit.
'Naschen' (to snack/nibble) can be used with the preposition 'von' + dative. This emphasizes that you are taking a small part of something larger, for example a piece from a whole cake.
Wer hat von der Torte genascht?
Who has been nibbling at the cake?
In its main meaning, 'naschen' (to snack) is often used without an object or with typical sweets. Common contexts are 'heimlich naschen' (to snack secretly) or 'zwischen den Mahlzeiten naschen' (to snack between meals).
Ich nasche abends gerne ein Stück Schokolade.
I like to snack on a piece of chocolate in the evening.
'Naschen' (to snack) is a very common word in everyday language. It often has an affectionate or harmless connotation, especially when talking about children.
Die Kleine nascht für ihr Leben gern Gummibärchen.
The little girl absolutely loves snacking on gummy bears.
The figurative, often erotic meaning is usually recognizable from a metaphorical context. A typical expression is, for example, 'von der verbotenen Frucht naschen' (to taste the forbidden fruit).
Die Affäre war für beide nur ein kurzes Naschen ohne ernste Absichten.
For both of them, the affair was only a brief taste, with no serious intentions.
to nibble
Knabbern and naschen can both describe eating small amounts. Knabbern emphasizes taking small bites of something relatively hard, such as nuts or pretzel sticks. Naschen, by contrast, emphasizes enjoying a treat, often something sweet eaten between meals.

Beim Film nascht Lea ein paar Stücke Schokolade.
Lea snacks on a few pieces of chocolate while watching the movie.
Beim Film knabbert Lea ein paar harte Salzstangen.
Lea nibbles on a few hard pretzel sticks while watching the movie.