Check every phrase or image that you write against a list of common cliches. You may find that the initial idea you had was something you heard on television or is a commonly said phrase--cliched language.
Write with specific language. Often, clichés are used as shorthand when writers want to get an idea across. However, cliches confuse the reader rather than provide understanding. Concrete sensory details like amounts, colors and temperatures can make your narrative clear and vivid.
Edit your work for fillers and obvious amounts of words. Simplify sentences when necessary and elaborate with specific descriptions that provide more meaningful connections to the subject of the work. Delete any obvious overused phrases or replace with a single word.
Read narratives written by master authors to see how experienced writers use specific language to avoid cliches.