base on

phrasal verb·1 sense·particle on

Meanings

1

Use something as the foundation or starting point

Why “on”? One thing supports another. A plan can depend on people, facts, money, or past success.

The film is based on a true story.
The film uses a true story as its starting point.
Her plan is based on last year's results.
Her plan uses last year's results as its starting point.

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The film is based on a true story. What does it mean?

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