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be a regionalism
此处 regionalism 是可数名词，指某个地区特有的表达方式。
This word is a regionalism that many locals recognize.
这个词是许多当地人都知道的地方用语。
地方色彩；地区特征
regionalisms — plural of regionalism
先理解核心含义，再看它在真实句子里的用法。
地方色彩；地区特征
a feature, such as a pronunciation, expression, or custom, that is characteristic of a particular region
This word is a regionalism that many locals recognize.
这个词是许多当地人都知道的地方用语。
对自己地区及其相关事物的热爱,常为过度。
Affection, often excessive, for one's own region and to everything related to it.
某一地区特有的特征(如发音、表达或习俗)
a feature (as a pronunciation or expression or custom) that is characteristic of a particular region
认为大部分或几乎所有政治权力应下放给地方政府的信念。
The belief that most or nearly all political power should be decentralized to regional governments.
以特定地理区域定义国家国际利益的外交政策
a foreign policy that defines the international interests of a country in terms of particular geographic areas
Using 'soda' for a sweet carbonated drink is a regionalism in the eastern United States.
用‘soda’来指甜味碳酸饮料是美国东部的一个地方说法。
The dictionary notes several regionalisms from Texas in its pronunciation entries.
这本词典在发音条目中标注了几个来自得克萨斯州的地方用语。
A regionalism can reveal where a speaker grew up.
一个地区特征能揭示说话者是在哪里长大的。
此处 regionalism 是可数名词，指某个地区特有的表达方式。
This word is a regionalism that many locals recognize.
这个词是许多当地人都知道的地方用语。
复数形式 regionalisms 常与 in 连用，说明地区或语言范围。
Some regionalisms in Canadian English differ from American usage.
加拿大英语中的一些地方用语与美国用法不同。
动词 use 后接 regionalisms 作宾语，再接不定式表示目的。
Writers use regionalisms to make dialogue more realistic.
作家使用地方用语让对话更真实。
Not this
There are many regionalism in this dialect.
Use this
There are many regionalisms in this dialect.
当 regionalism 表示‘地区特有的词语、发音或习俗’时是可数名词，复数形式为 regionalisms。many 后必须接可数名词复数，所以要用 regionalisms 而不是 regionalism。
Not this
This word is a regional.
Use this
This word is a regionalism.
regional 是形容词，不能直接用作名词；表示‘地区特有的词语或特征’的名词是 regionalism。因此，在 a 后面要用名词 regionalism，而不能用形容词 regional。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
英语中的地区特征
The word 'soda' is one of many regionalisms in English.
英语中有许多地区性词语，‘soda’就是其中之一。
发音的地区特征
The Boston way of dropping the "r" is a pronunciation regionalism.
波士顿人省略“r”发音的方式是一种发音的地区特征。
地方特有说法
Local regionalisms like "bless your heart" can confuse outsiders.
像“bless your heart”这样的地方特有说法可能会让外地人困惑。
Use regionalisms naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
region（地区）加上表示“特征/主义”的-ism，联想“某个地区独有的口音或风俗”，就是regionalism（地方色彩）。
语域：formal 常见场景：linguistics、dialectology、cultural geography 此处指“某一地区特有的语言、习惯或文化特征”，多用于语言学、方言研究和文化地理等偏学术或较正式的场合；日常口语中较少单用 regionalism，而更常说 regional word/feature 等。
None of these rhyme with regionalism, whose stress is on the first syllable /riː/, because the following sounds differ. All six share the spelling and unstressed ending -ism /ɪzəm/. Realism begins with /riː/ like regionalism, but the next sound is /l/ rather than /dʒ/, so it is a useful lookalike, not a rhyme.
Dictionary facts from ECDICT, WIKTIONARY.