phase in
Upper Intermediate (B2)neutral
To start using something new slowly, a little at a time, so the change isn't too sudden.
"The new safety regulations will be phased in over three years to give businesses time to adjust."
Hear it in context
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[Co-Stream] Call of Duty League Major III Qualifiers | Week 3 Day 3
Call of Duty · 46:48
Lost it to phase in Birmingham.

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Gary Savage · 11:41
the bloodbath phase in the dollar is

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20 gram loading phase in order to saturate

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Intelligence Squared · 72:04
roughly initial phase in which you mainly learn

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Tarayummy · 14:30
No, I went through the phase in 2011.