Longman Dictionary of Contemporary English homepage

dull

2 verb
     
dull2
1 [transitive] to make something become less sharp or clear:
He drank some alcohol to dull the pain.
Her fear and anxiety dulled her mind.
2 [intransitive and transitive] to become less bright or loud, or to make something become less bright or loud:
His eyes dulled a little.
The constant rain dulled all sound.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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