noun
dialect; regional language
Refers to a regional dialect or local speech variety. Often used in linguistic or literary contexts.
See also: 俚言
この小説には東北地方の俚語が多く使われている。
This novel uses many dialect words from the Tohoku region.
noun
colloquial language; slang; vernacular
Refers to everyday informal language, including slang and expressions used by common people rather than formal or literary language.
俚語を交えた会話は親しみやすい。
Conversation mixed with colloquial language feels approachable.
この辞書は俚語も収録している。
This dictionary also includes slang.
俚言 is a synonym also meaning dialect or colloquial word; 俚語 is more commonly used for the broader concept of colloquial language.
方言 is the standard modern term for dialect; 俚語 is a more literary or technical term.
俗語 specifically means slang or vulgar language, while 俚語 can encompass both dialect and informal speech.
From Chinese 俚語 (lǐyǔ), combining 俚 (rustic, vulgar) and 語 (language). The exact historical borrowing path is uncertain.