Question 1

What does "phase out" mean?

Accepted Answer

To stop producing or selling a product gradually over time.

Question 2

How do you use "phase out" in a sentence?

Accepted Answer

The manufacturer decided to phase out the older model as demand dropped.

Question 3

Is "phase out" formal or informal?

Accepted Answer

"phase out" is register-neutral — appropriate in both casual and formal contexts. Very commonly used in business, environmental, and government contexts. Can appear in passive constructions: 'leaded petrol was phased out in the 1990s'. Frequently collocates with products, chemicals, technologies, and policies that are becoming obsolete or harmful. Common in both British and American English.

phase out

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