Why Do Americans Say Mom And We British Say Mum?

[dave50]

I would have thought mum is short for mummy, so why the mom?

[ummmm]

Mam and mammy.

[burlyshirley]

Always Mum for me. My Dad used to call his Mam. I like both.

[piggynose]

DTC..are you saying the brits are tapped? Pmsl.

[eve1974]

Mom is short fir mommy or momma

[Peter Pedant]

oop t north we have the third parent - - - moomeh !

[pastafreak]

It's all about the history of language and pronunciation. Some changes obviously go back to when settlers moved across the pond. And there's something called "the great vowel shift". Who knew? ;)
This is interesting...I like the Twitter maps.

https://unravellingmag.com/articles/mum-mom-mam/

[mibn2cweus]

Mum's the word:

https://en.wikipedia.org/wiki/Mum%27s_the_word#:~:text=%22Mum's%20the%20word%22%20means%20to,mummer%20who%20acts%20without%20speaking.