美 [ˌɪdɪəˈmætɪk ɪkˈspreʃn]
习语：一种固定的、具有特定意义的词组，通常不能从字面意义上理解。
an expression whose meanings cannot be inferred from the meanings of the words that make it up
同义词： idiom / phrasal idiom / set phrase / phrase
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惯用语；成语性词语
"To pull a face" is an idiomatic expression.
“愁眉苦脸”是一个习惯表达法。
Do not use obscenities slang or too many idiomatic expression when using an interpreter.
在使用翻译的时候，不要使用不雅的词语、俚语，或使用太多的俗语。
An idiomatic expression in one language could sound completely stupid when translated word for word into another.
在一种语言中的成语性词语，逐字逐句翻译成另一种语言的时候听起来会彻底地愚不可及。
The former he associated with professional and court paintings, the latter with literati or amateur scholar-artists who looked to the idiomatic brushstrokes of past masters and prized painting as an expression of one's inner self and life force.