who says A, must say B
who
hu:
hoo
says
seɪz
seiz
A,
ei
must
mʌst
mast
say
seɪ
sei
B
bi:
bi

Определение и значение слова «who says A, must say B» на английском языке

who says a, must say b
01

used to suggest that if someone starts or initiates a particular action or process, it is expected that they will continue and complete the subsequent steps 

пословица
Примеры
If you promise to do something, you must follow through with it. As the saying goes, who says A, must say B. 
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