@ManOfKent
The issue is quite extensive. That break it down for me thread should help.
But broadly, the definitions of men and women are being changed by a tiny, but very powerful lobbying minority.
It matters very much to women what constitutes the word woman, as feminism addresses the disadvantage that women face. If you can't, legally, define the word woman you can't address the issues.
Hence transactivists being perfectly sincere when they say a parliament made up of 50% women and 50% transwomen (men identifying as women), fulfils diversity quotas.
Or that Karen White a convicted sex offender and rapist being housed in a female prison is correct, as Karen identifies as a woman. (It was only the fact that Karen sexually assaulted four women there, that made the authorities put them back in the male estate.)
Or Rachel McKinnon, erstwhile mediocre male bodied athlete, winning a world record female cycling championship. And that being absolutely fine, because according to Rachel, there is no difference between transwomen and women, other than women not trying hard enough.
And hence the dictionary definition, and a necessary one for feminism, being that woman is an adult human female, is now considered wrong.
Not just wrong, but bigoted and a transphobic. Because a handful of men don't like it.