Longman Dictionary of Contemporary English homepage

byword

 noun
     
by‧word
1

be a byword for something

to be so well known for a particular quality that your name is used to represent that quality:
His name has become a byword for honesty in the community.
2 [singular] a word, phrase, or saying that is very well known:
Caution should be a byword for investors.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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