Longman Dictionary of Contemporary English homepage

top-down

adjective
     
top-down [only before noun] British English
1 a top-down way of organizing a business is one in which the most important people make decisions and tell the people below them what they should do:
The company has a top-down management system.
a top-down approach to decision-making
2 a top-down way of understanding or explaining something starts with a general idea and adds details later

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