须 On the HSK 7-9 vocabulary list, at CEFR level C2. xū ㄒㄩ 須 must 須 to have to 須 to wait 鬚 beard 鬚 mustache 鬚 feeler (of an insect etc) 鬚 tassel Sources CC-CEDICT, CC BY-SA 4.0 pinyinjs, Apache-2.0 国际中文教育中文水平等级标准, 中华人民共和国教育部, MIT