was denkst du, was

what do you think …?

→ was
phrase Rare #38,845
what do you think …? The second “was” introduces the rest of the question.
GE: Was denkst du, was sie heute Abend kochen?
EN: What do you think they’re cooking tonight?

Was denkst du, was ein Erwachsener jetzt zu einem Kind sagen sollte?

What do you think an adult should say to a child right now?

— Battle Royale (2000)

Was denkst du, was ich mache?

What do you think I’m doing?

Was denkst du, was Tom jetzt macht?

What do you think Tom is doing now?

Norman, was denkst du, was du tust?

Norman, what do you think you're doing?

— Psycho (1960)

Was denkst du, was ich hier mache?

What do you think I’m doing here?

Was denkst du, was sie wollen?

What do you think they want?