/'baɪwɜ:d; `baɪ,wɝd/
n
1 ~ for sth person or thing considered to be a notable or typical example of a quality 代表某种品性的人或事物
*His name has becomea byword for cruelty. 他的名字成了残酷无情的别称.
* The firm is a byword for excellence. 这家商号是优质的保证.
2 common saying or expression 俗语; 谚语.

n
be a byword for sth
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.
[singular]
a word, phrase, or saying that is very well known
　Caution should be a byword for investors.