haemifacial spasm
noun [ C ] medical UK specialized (US hemifacial spasm) uk/hiː.mɪˌfeɪ.ʃəl ˈspæz.əm/ us/ˈhiː.məˌfeɪ.ʃəl ˈspæz.əm/
半面痉挛
a spasm (= occasion when a muscle suddenly becomes tighter) affecting one side of the face
Haemifacial spasms are caused by a blood vessel pressing on one of the nerves coming from the brain. 半面痉挛是由于血管压迫一股大脑神经造成的。