Fell (a tree) (7)
(Other definitions for hew that I've seen before include "Shape wood, as with an axe" , "Carve with axe" , "Chop (wood)" , "'Cut, fell or shape (3)'" , "Carve out of wood or stone" .)
(Other definitions for cut down that I've seen before include "Felled" , "Fell a tree or reduce usage as in a diet" , "Reduce the length of" , "Economise or despatch with sword" .)