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general::
Phrase(s): *innocent as a lamb and *innocent as a newborn babe
1. guiltless. (*Also: as ~.) • "Hey! You can’t throw me in jail," cried the robber. "I’m innocent as a lamb." 2. naive; inexperienced. (*Also: as ~.) • She’s eighteen years old, but innocent as a newborn babe.
McGrawhill's American Idioms And Phrasal Verbs