Definition of 'lessen'
Word forms: lessens, lessening, lessened
transitive verb/intransitive verb
If something lessens or you lessen it, it becomes smaller in size, amount, degree, or importance.
lessening uncountable noun
COBUILD Advanced English Dictionary. Copyright © HarperCollins Publishers
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lessen
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lessen in American English
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lessen
British English: lessen
VERB /ˈlɛsən/
If something lessens or you lessen it, it becomes smaller in size, amount, degree, or importance.
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Definition of lessen from the Collins English Dictionary
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