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

Kahulugan at ibig sabihin ng "who says A, must say B"sa English

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 

salawikain
Mga Halimbawa
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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