What is the meaning of "Lo Sefa'er"?
Rashi: 'Do not take its glory 1 (the last remaining fruit) from it'.
Rashi (in Chulin, 131b): It is a word that has two opposite meanings - like "Tesharesh", in the Pasuk in Iyov, u've'Chol Tevu'asi Tesharesh" 31:12, which means there 'to uproot'.
Why does the Torah add the word "Acharecha'"?
Rashi: "Acharecha" comes to add the Din of Shikchah to trees.