Descriptive expressions as a means of elevated speech

A descriptive expression names a thing or event not directly but by a coloured, figurative description of it: instead of cotton “oq oltin” (white gold), instead of oil “qora oltin” (black gold), instead of forests “yer yuzining o‘pkasi” (the lungs of the Earth). In terms of information it gives nothing more than the plain name, but it adds feeling and evaluation. That is why it cannot be used in every text: it fits a newspaper article, a literary work and a solemn speech, but is out of place in scientific, official and business papers, where an exact name is required. Such expressions can also be homonymous: the context shows what is meant (for example, “qora oltin” is usually oil, sometimes coal). Repeating the same expression too often turns it into a cliché and weakens its effect.