Meaning of “flatten” in the English Dictionary

"flatten" in British English

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flattenverb [ I or T ]

uk /ˈflæt.ən/ us /ˈflæt̬.ən/

flatten verb [ I or T ] (BECOME LEVEL)

C2 to become level or cause something to become level:

Several trees were flattened (= knocked down) by the storm.
The path flattens (out) (= does not go up so much) as it reaches the top of the hill.

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(Definition of “flatten” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"flatten" in American English

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flattenverb [ I/T ]

us /ˈflæt·ən/

to make or become flat:

[ I ] In the road race, you go over a few steep hills but then the course flattens out.

(Definition of “flatten” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"flatten" in Business English

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flattenverb [ I or T ]

uk /ˈflætən/ us

to stop increasing or stop something from increasing:

to flatten prices/profits
The economy hit a peak about a year ago and now it's flattening.

HR to reduce the number of different levels of managers and other employees in an organization:

We are taking out a level of management and flattening the organization.

Phrasal verb(s)

(Definition of “flatten” from the Cambridge Business English Dictionary © Cambridge University Press)