phase down
中高级 (B2) formal
To slowly use less or do less of something over a period of time.
"The government agreed to phase down coal power generation by 40% over the next decade."
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[Co-Stream] Call of Duty League Major I Tournament | Day 3
Call of Duty · 90:28
Phase down.
How this climate conference secured a breakthrough
Simon Clark · 2:15
For the first time, the phase down of coal was mentioned in the final text.