'Dresser' in the Bible

Then answered Amos, and said to Amaziah, I was no prophet, neither was I a prophet's son; but I was a herdsman, and a dresser of sycomore-trees:

and His clothes became radiant and dazzling, intensely white, as no launderer on earth can whiten them.

Then said he unto the dresser of his vineyard, Behold, these three years I come seeking fruit on this fig tree, and find none: cut it down; why cumbereth it the ground?