The preposition ku is used for comitatives (as in Example 141), instrumentals (as in Example 138), and NP coordination. It is also used in more idiomatic combinations, as also illustrated here, in Examples 49 (figurative instrumental), 139 and 140.
Source: Kouwenberg 2003: 162
Source: Van Putte and García 1990: 189
Source: Kouwenberg nd
Source: Kouwenberg nd
Source: nd: 3 July 2009, p.5