'Pandas Cummax starting with x row

I want to have cummax start at x index Psuedocode would be:

   df['highest']= df['somenumber'](starting at index x).cummax()
   df['somenumber'] is 10,50,30,20,80,5
   x=2 
   df['highest'] would be 0,0,30,30,80,80

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'Pandas Cummax starting with x row

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