打针 (dǎ zhēn) = to give/get an injection. 针灸 (zhēnjiǔ) = acupuncture. 针 is also a measure word for injections: 打了三针 (got three shots).
culture
针灸 (zhēnjiǔ, acupuncture) is one of the pillars of traditional Chinese medicine, using thin needles at specific body points to treat various conditions.