idiom

1. 他(-t)是个白痴 => idiot. 妈妈(-m)教我学习成语、习语、方言 => idiom.
2. idiot, idiom => 白痴他(-t, idiot)记不住习语.

idiom 习语，习惯

来自希腊语idios,个人的，自己的，来自PIE*swe,个人，自己，词源同self,swain,custom.引申词义个人的生活习惯，个人的说话方式，后抽象化为习语，习惯。

idiom (n.)

1580s, "form of speech peculiar to a people or place," from Middle French idiome (16c.) and directly from Late Latin idioma "a peculiarity in language," from Greek idioma "peculiarity, peculiar phraseology," from idioumai "to appropriate to oneself," from idios "personal, private," properly "particular to oneself," from PIE *swed-yo-, suffixed form of root *s(w)e-, pronoun of the third person and reflexive (referring back to the subject of a sentence), also used in forms denoting the speaker's social group, "(we our-)selves" (cognates: Sanskrit svah, Avestan hva-, Old Persian huva "one's own," khva-data "lord," literally "created from oneself;" Greek hos "he, she, it;" Latin suescere "to accustom, get accustomed," sodalis "companion;" Old Church Slavonic svoji "his, her, its," svojaku "relative, kinsman;" Gothic swes "one's own;" Old Norse sik "oneself;" German Sein; Old Irish fein "self, himself"). Meaning "phrase or expression peculiar to a language" is from 1620s.

1. It was an old building in the local idiom.

这是一座具有当地特色的古建筑.

2. I like the idiom of modern popular music.

我喜欢现代流行音乐的风格.

3. And nothing was so irritating as the confident way he used archaic idiom.

没什么比他使用过时的方言时那种自负的神态更气人的了。

4. McCartney was also keen to write in a classical idiom, rather than a pop one.

麦卡特尼也热衷于古典风格而不是通俗风格的创作。

5. She is, in fact, a perfect illustration of the French idiom "to be comfortable in one's own skin."

实际上，她很好地诠释了“欣然接纳自我”这一法语习语的意思。

【speech, laguage, tongue, slang, dialect, idiom】
这组词都有“语言”的意思，其区别是：
speech: 特指人的口语，也指正式的讲话。
laguage: 普通用词，含义广。指人的语言或文字，或动物的语言。既可指口头或书面语言，也可指手势语等。
tongue: 书面用词，指人的语言，亦指人的母语。
slang: 指俚语。
dialect: 指一种语言中，某一地方所特有的语言形式，即方言。
idiom: 指一种语言中一般由几个词结合成短语或句子的特殊表达方式，即惯用语、成语。也指方言。