Sentence:  `` Unless the oyabun has been working on it '' , he said , then checked himself and added : `` You can tell Kayabashi-san that the back road is in very good condition and will be quite safe for his party to <WSD>use</WSD> '' . 
Meaning of the word marked with <WSD> tags:  put into service; make work or employ for a particular purpose or for its inherent or natural purpose