household word

noun
a familiar name, phrase, saying, etc.; byword: The advertising campaign is designed to make this new product a household word.

Origin:
1590–1600

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
household name or household word
 
n
a person or thing that is very well known
 
household word or household word
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Acrylonitrile is not a household word, but products made from it are ubiquitous in our homes.
Access to medical home has almost become a household word for better or worse.
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