A custom, later incorporated into the Mosaic Law, whereby a man would marry the sonless widow of his deceased brother in order to produce children to carry on his brother's line.
Ke tlwaelo e moragonyana e neng ya tsenngwa mo Molaong wa ga Moshe, e mo go yone monna a neng a nyala mosadi wa ga morwarraagwe yo o tlhokafetseng a se na bana ba basimane.