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general::
Phrase(s): Half the truth is often a whole lie.
Prov. If you do not tell the whole truth, you can mislead people just as if you tell them an outright lie. • Jill: You lied to me. Jane: I did not. Everything I said was true. Jill: But you didn’t tell me the whole story. And half the truth is often a whole lie.
McGrawhill's American Idioms And Phrasal Verbs