"Cut the cake" is the commonly used phrase in Engpsh to describe the act of cutting a cake.
The origin of the phrase is unclear, but it is pkely a simple, straightforward way to describe the physical action of cutting through the cake with a knife to create pieces.
Examples:
"Can you please cut the cake into spces for the guests?"
(请把蛋糕切成片给客人好吗？)
"I'll go ahead and cut the cake for the birthday celebration."
(我会先去把蛋糕切好，为生日庆祝做准备。)