downgrade

some jobs had gradually been downgraded from skilled to semi-skilled

いくつかの仕事は徐々に熟練から半熟練に格下げされた。

downgrades by debt-rating agencies outnumber upgrades by five to one

債務格付け機関による格下げは格上げの五倍にのぼる。

a steep downgrade for which he had to put the car in second

彼は二速に入れなければならない急な下り坂。