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4.3. Peculiar Use of Set Expressions
A cliché is an expression that has become hackneyed and trite.
Proverbs and Sayings are facts of language. They are brief statements showing in a condensed form the accumulated life experience of the community and serving as conventional practical symbols for abstract ideas They are collected in special dictionaries.

E.g. Out of sight, out of mind.
An epigram is a SD similar to a proverb; but they are made by individuals whose names we know, while proverbs are invented by people in general.

E.g. A thing of beauty is a joy forever. (Keats)
A quotation is an exact repetition of a phrase or statement from a book, speech, and the like used by way of illustration. By repeating a passage in a new environment we attach more importance to the utterance. Quotations are usually marked off in the text by inverted commas (‘…’), dashes (-) or italics.
An allusion is an indirect reference, by word or phrase, to a historical, literary, mythological, biblical fact or to a fact of everyday life made in the course of speaking or writing. It differs from quotation, because it does not need to repeat the exact wording of the original. An allusion is only a mention of a word or phrase that may be regarded as the key word whose meaning is broadened into a general concept.

E.g. Where is the road now, and its merry incidents of life!.. Old honest, pimple-nosed coachmen? […] Is old Weller alive or dead? (Thackeray) /here the allusion is made to the coachman, Old Mr. Weller, the father of Dickens’s famous character, Sam Weller/