Meaning of “lessen” in the English Dictionary

"lessen" in American English

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lessenverb [ I/T ]

us /ˈles·ən/

to become or make something smaller in amount or degree:

[ T ] Keeping your weight down can lessen the risk of heart disease.

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

"lessen" in Business English

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lessenverb [ I or T ]

uk /ˈlesən/ us

to make something smaller, less noticeable, etc., or to become smaller, less noticeable, etc.:

Corporate executives are keen to embrace "green technology" in order to lessen their dependence on fossil fuels.
Increasing security procedures is the only way to lessen the risks of air travel.
lessen the impact/importance/influence (of sth) Experts argue that a carbon tax would lessen the influence of special-interest groups in the climate change debate.

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