Does "three knocks and nine worships" mean nine worships?

No, three knocks and nine worships are a kind of sacrifice ceremony of ancient Chinese in China, a traditional sacrifice ceremony widely adopted by Han people in China during the feudal society, and a continuation, extension and refinement of the sacrifice ceremony.

In modern times, Han people in China should not do this kind of action, but "three knocks and nine obeisances" is a courtesy to show respect to subordinates, elders, students, teachers and parents during the New Year.