方言 meaning in English — brogue, dialect, idiom

English meaning

brogue noun A strong dialectal accent, usually Irish or Scottish.
dialect noun A form of a language spoken in a particular region or by a particular group, differing from the standard version in vocabulary, grammar, or pronunciation.
idiom noun A phrase whose meaning can't be worked out just from the words in it, such as "kick the bucket."

方言 is used for these senses in English:

brogue A strong dialectal accent, usually Irish or Scottish.
dialect (linguistics, strict sense) A lect (often a regional or minority language) as part of a group or family of languages, especially if they are viewed as a single language, or if contrasted with a standardized idiom that is considered the 'true' form of the language (for example, Bavarian as contrasted with Standard German).
idiom A manner of speaking, a mode of expression peculiar to a language, language family, or group of people.