The difference between Expression and Idiom
When used as nouns, expression means the action of expressing thoughts, ideas, feelings, etc, whereas idiom means a manner of speaking, a mode of expression peculiar to a language, person, or group of people.
check bellow for the other definitions of Expression and Idiom
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Expression as a noun:
The action of expressing thoughts, ideas, feelings, etc.
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Expression as a noun:
A particular way of phrasing an idea.
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Expression as a noun:
A colloquialism or idiom.
Examples:
"The expression "break a leg!" should not be taken literally."
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Expression as a noun:
A facial appearance usually associated with an emotion.
Examples:
"They stared at the newcomer with a puzzled expression."
"The best poker players can tell if the opponents have a good hand by looking at their expression."
"Her expression changed from joy to misery after realising her winning lottery ticket had expired."
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Expression as a noun (mathematics):
An arrangement of symbols denoting values, operations performed on them, and grouping symbols.
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Expression as a noun (biology):
The process of translating a gene into a protein.
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Expression as a noun (programming):
A piece of code in a high-level language that returns a value.
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Expression as a noun:
A specific blend of whisky.
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Expression as a noun (biology):
The act of pressing or squeezing out.
Examples:
"expression from a gland"
"the expression of milk from the mammaries"
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Expression as a noun (music):
The tone of voice or sound in music.
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Idiom as a noun:
A manner of speaking, a mode of expression peculiar to a language, person, or group of people.
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Idiom as a noun:
A language or language variety; specifically, a restricted dialect used in a given historical period, context etc.
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Idiom as a noun:
An established expression whose meaning is not deducible from the literal meanings of its component words, often peculiar to a given language.
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Idiom as a noun:
An artistic style (for example, in art, architecture, or music); an instance of such a style.
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Idiom as a noun (programming):
A programming construct or phraseology that is characteristic of the language.