downgrade
[verb]
Synonyms: demote, degrade, humble, lower or reduce in rank, take down a peg (informal)

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Antonyms: upgrade

[TahlilGaran] English Synonym Dictionary ▲

down‧grade /ˈdaʊnɡreɪd/ verb [transitive]

1. to make a job less important, or to move someone to a less important job Antonym : upgrade

2. to make something seem less important or valuable than it is:
Police often downgrade the seriousness of violence against women in the home.

3. to state that something is not as serious as it was:
Hurricane Bob has been downgraded to a tropical storm.

[TahlilGaran] Dictionary of Contemporary English ▲