To accept punishment in Engpsh, you can say "accept punishment" or "accept the consequences". This phrase comes from the idea that when you do something wrong, you should be wilpng to face the consequences of your actions. For example:
"I made a mistake, and I'm wilpng to accept punishment for it." (我犯了一个错误，我愿意接受惩罚。)
"I knew the rules, and I knew what would happen if I broke them. I accept the consequences." (我知道规则，我知道如果我违反规则会发生什么。我接受后果。)
In both of these examples, the speaker is saying that they understand they have done something wrong, and they are wilpng to face the punishment or consequences that come as a result.