forbid : Idioms & Phrases
forbidden city
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noun the sacred city of Lamaism; known as the Forbidden City for its former inaccessibility and hostility to strangers
Lhasa; Lassa; capital of Tibet.
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noun a walled section of Beijing that encloses the palace that was formerly the residence of the emperor of China
WordNet
forbidden fruit
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noun originally an apple from the tree of knowledge of good and evil in the Garden of Eden; it is now used to refer to anything that is tempting but dangerous (as sexuality)