expression, godan verb (-u)
take good care of oneself; look after one's health
A somewhat literary or formal expression meaning to be mindful of one's own well-being, often used in contexts of avoiding overwork or danger.
彼は身を厭わずに働き続けた。
He kept working without sparing himself.
どうか身を厭って、無理をなさらないで
Please take care of yourself and don't overdo it.