safeguard
verb [ T ] uk/ˈseɪf.ɡɑːd/ us/ˈseɪf.ɡɑːrd/
保护，保卫；捍卫，维护
to protect something from harm
The union safeguards the interests of all its members. 工会捍卫每个会员的利益。
Phrasal verb
safeguard against something 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。