To provide interesting and vivid conversation.
Authors use idioms the same way everybody else does -- by peppering their speech (writing) with colorful phrases!
There are many idioms and phrases for 'on the back burner'. Some idioms and phrases for 'on the back burner' include 'pushing aside' and 'procrastinating'.
Moon Phrases or Idioms (http://dictionary.reference.com/browse/idiom) are phrases that refer to the moon, but use the reference in the way that other words are used in Idiomatic speech. Check this link for some common Moon Idioms and expressions that you may already know. http://home.hiwaay.net/~krcool/Astro/moon/moonwords/index.htm Some other idioms you may know are listed here: http://www.idiomsite.com/
Not always. Sometimes idioms are just phrases.
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For better for worse
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There are no precise words. Idioms are just phrases that catch on.
Commonly used phrases from a given language are often referred to as idioms, expressions, or colloquialisms. They are phrases that have a unique meaning that may not be directly translatable to other languages.
Phrases unique to a particular language are called idioms. These expressions often have a figurative meaning that is different from the literal translation of the words used.
There are no idioms that are one word. Idioms are phrases that make no sense until you know the definition.
She's a real drama queen.