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Boshof ǃUi is an extinct ǃKwi language or dialect of South Africa. It was recorded at the town of Boshof, between Kimberley and the Vaal River, by Maingard some time after 1930, and labeled simply "ǃUi" (that is, ǃKwi), the word for 'person' in Boshof and related languages. It is closely related to Seroa, but analysis of the recorded data has not been enough to determine the boundary between language and dialect.
References
Tom Güldemann. 2019. Toward a subclassification of the ǃUi branch of Tuu. Paper presented at Afrikalinguistisches Forschungskolloquium at Humboldt Universiät zu Berlin, 8 January 2019. 10pp.