Shugoshi funyu means that in the Kamakura period and the Muromachi period, the bakufu (Japanese feudal government headed by a shogun) forbade shugo (provincial constables) and their officials from entering some specific koryo (public lands), shoen (manors), and so on, which were specified by the bakufu, when pursuing criminals and collecting taxes.
守護使不入（しゅごしふにゅう）とは、鎌倉時代・室町時代において幕府が守護やその役人に対して犯罪者追跡や徴税のために、幕府によって設定された特定の公領や荘園などに立ち入る事を禁じたこと。