dünnen

In a sentence

• Das dünne Eis brach unter meinem Gewicht.

  The thin ice broke under my weight.

  Here, 'dünne' is used as an adjective describing the thickness of the ice, meaning 'thin'.

• Ich muss die Farbe dünner machen, bevor ich sie benutze.

  I need to thin the paint before using it.

  In this sentence, 'dünner' is the comparative form of 'dünn,' used to indicate making something thinner.

• Im Winter dünnen die Reihen der Vögel im Park aus.

  In winter, the flocks of birds in the park thin out.

  Here, 'dünnen' is the verb form, meaning 'to thin out,' describing the reduction in the number of birds.