The doctor advised him to check his blood pressure at home, as it might just be white-coat effect at the clinic.

white-coat 是由 white（白色的）和 coat（外套）组成的复合形容词，字面意思是"白色外套的"。 effect 是名词，意思是"效果、影响"。 white-coat effect 指"白大褂效应"，描述患者在医疗机构看到穿白大褂的医护人员时，由于紧张导致血压升高的现象。