Article: Many native speakers of Dutch, both in Belgium and the Netherlands, assume that Afrikaans and West Frisian are dialects of Dutch but are considered separate and distinct from Dutch: a daughter language and a sister language, respectively. Afrikaans evolved mainly from 17th century Dutch dialects, but had influences from various other languages in South Africa. However, it is still largely mutually intelligible with Dutch. (West) Frisian evolved from the same West Germanic branch as Old English and is less akin to Dutch.

Question: What two-word phrase describes the relationship whereby Dutch and Afrikaans speakers can understand each other?
mutually intelligible