To plan something carefully, thinking through all the specific details.
"She spent the whole evening planning out the itinerary for their road trip across Europe."
To organize and decide on all the details of something carefully and thoroughly.
To carefully think about all the steps of something and decide exactly how it will happen.
2 meanings, ordered from most common to least. Color-coded by CEFR level.
To plan something carefully, thinking through all the specific details.
"She spent the whole evening planning out the itinerary for their road trip across Europe."
To develop or unfold according to a plan (often used with 'well' or 'perfectly').
"The surprise party planned out perfectly — she had absolutely no idea."
The 'out' adds a sense of thoroughness or completeness — planning something fully from start to finish. Common in both British and American English. Widely used in project management, travel, and organizational contexts. Can be used with a reflexive sense ('it all planned out perfectly').
Natural word combinations native speakers use most often.
The five tense forms you'll use most often.
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