Commonly confused
Phase in vs Phase out
“Phase in” and “Phase out” look alike but pull in different directions. Here is what each one means, with examples — and the difference that learners most often miss.
The key difference
Phase in means introduce something gradually in stages. Phase out means discontinue gradually.
phase in
- 1
Introduce something gradually in stages
“They'll phase in the new system.”
phase out
- 1
Discontinue gradually
“They phased out the old model last year.”
Stop mixing them up
Sink In turns confusable pairs like this into quick contrast drills, so the right particle becomes automatic.