Y uno de las más frecuentes embarazo mexico y africano
A '''fixed expression''' is a standard form of [[Idiom|expression]] that has taken on a more specific meaning than the expression itself. It is different from a [[proverb]] in that it is used as a part of a [[Sentence (linguistics)|sentence]], and is the standard way of expressing a [[concept]] or [[idea]].
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Examples include:
* ''all of a sudden''
* ''come into mind''
* ''fall in line''
* ''I can assure you''
* ''so to speak''
* ''surf the web''
* [[Siamese twins (linguistics)|Siamese twins]] or irreversible binomials like ''mix and match'', ''wear and tear'', and ''[[rock and roll]]''
* trinomials (3-word fixed expressions); e.g. ''lights, camera, action''; ''[[Signed, sealed, and delivered (disambiguation)|signed, sealed, and delivered]]''; and ''lock, stock, and barrel''.
