scot-free

scot-free
/ˌskɔt ˈfri:; ˌskɑt `fri/ adv
without punishment or harm 免受惩罚; 免受伤害
    The accused got off/escaped scot-free because of lack of evidence. 由於证据不足, 被告未受惩罚.

牛津英汉双解词典