safeguard against something
phrasal verb with safeguard verb [ T ] uk/ˈseɪf.ɡɑːd/ us/ˈseɪf.ɡɑːrd/
预防，避免
to do things that you hope will stop something unpleasant from happening
A good diet will safeguard against disease. 搭配合理的饮食可以预防疾病。