Green’s Dictionary of Slang

(S.Afr.) a police officer.

[1827		G. Thompson Travels I 285: Being supplied by the Landdrost, Mr. Ryneveld, with fresh horses, and a dienaar (police man) to accompany me, I arrived, in a few hours, at Rondebosch [DSAE]].
1946		cited in Partridge DU (1949).
1960		J. Cope Tame Ox 74: ‘You tell the dieners once, not twice.’ ‘You lie! I never told the police nothing.’.
1963		A.M. Louw 20 Days that Autumn 86: The ‘Kaffers’ had been to the charge office to ask the ‘dienders’ to arrest them for not carrying their passes.
1982		in J. & W. Branford Dict. S. Afr. Eng. (1987).