Mutual intelligibility

From Teflpedia

Mutual intelligibility is a property of languages and dialects.

Specifically in the case of English, Scots is either considered a separate language, or a dialect of English, and is generally intelligible to English, Irish and Welsh people who possess some knowledge of the Scottish English dialect. Whereas it might be unintelligible to Americans without exposure to Scottish English. Otherwise, English doesn't really have any (other) languages with which it is mutually intelligible.

Notwithstanding, it's possible to construct some sentences in Germanic languages and French that would be understood, though these are a bit simplistic and artificial.