to reduce the effectiveness of something

They were accused of trying to emasculate the report's recommendations. 他们被指责企图贬低报告的可取之处。

to make a man feel less male by taking away his power and confidence

But another man in his forties, whose in-laws are rich, finds it hard to accept gifts from them: "I feel emasculated in that old-fashioned role of provider.”

I think that may be a step forward, to have people other than women project their desire onto you without feeling it emasculates you.

to castrate (= remove the male sexual parts of) a man or male animal, or to remove the male parts of a plant

Last night, Trude assisted in her first castration since emasculating a guinea pig back in Bristol: this time it was a camel.