kill *oneself on the death of *his/her master / die a martyr to / kill oneself on the death of one's lord / sacrifice *oneself for / sacrifice *one's own life in order to follow *his/her lord / follow *one's lord to the grave

fog / mist

information theory

gradual decline of *someone's fortune / get poorer gradually / gradual pauperization

get worse little by little / take a slow downhill slide

sagging / gradual decline of stock prices / decline gradually / slip downward slowly

Zr / zirconium

Zr / zirconium

written appointment / official notification / [government] order / official announcement of appointment / letter of appointment / official written notification of appointment

case method