说一不二
shuō yī bù èr
one’s word is final
Character by character
说shuō
say
say
一yī
one
one
不bù
not
not
二èr
two
two
Example
在我们家，奶奶说一不二。
In our family, Grandma’s word is law.
Tone: neutral.
Usage and origin
Can praise someone who keeps their word, or describe someone who takes no argument.
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