downgrade

[1]	demote , dethrone , humble , lower , reduce , displace , depose , dispossess , disfranchise/disenfranchise , (US) (Military) bust , (Colloq) bring/take down a peg
[2]	belittle , minimize , play down , disparage , decry , denigrate , run down , (US/Canadian) downplay

[1]	descent , decline , declension , (downward) slope , gradient , grade , inclination
[2]	on the downgrade , on the wane , waning , declining , falling , slipping , falling off , losing ground , going downhill , (US/Canadian) on the skids