Learn what "that wasn't a part of the plan" means, when people say it, and how to use it naturally in English.

It means something happened that was not supposed to happen according to the plan.
From The Perfect Husband, Episode 38
The speaker reacts to a plan failing or going differently than expected.
Use this when a situation changes and you want to point out the mistake or surprise. It is common and reusable, but usually not enough for a dedicated phrase page.
Scenes unlock real expressions as you watch
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