唏嘘 Traditional form: 唏噓 Pinyin (reading): xīxū Definitions: (onom.) to sigh to sob Characters: 唏 - to weep, to sob; to grieve 嘘 - to blow, to exhale, to hiss, to sigh; to praise Traditional characters: 唏 - to weep, to sob; to grieve 噓 - to blow, to exhale, to hiss, to sigh; to praise