זֵיתִ֛ים יִהְי֥וּ לְךָ֖ בְּכָל־גְּבוּלֶ֑ךָ וְשֶׁ֙מֶן֙ לֹ֣א תָס֔וּךְ כִּ֥י יִשַּׁ֖ל זֵיתֶֽךָ׃
네 모든 경내에 감람나무가 있을지라도 그 열매가 떨어지므로 그 기름을 네 몸에 바르지 못할 것이며
Rashi on Deuteronomy
ישל means, it (the olivetree) shall drop its fruits. It is similar in meaning to the verb in (Deuteronomy 19:5), "And the iron falleth off (ונשל).
Rashbam on Deuteronomy
ישל, from the root נשל as in Deut. 7,1 ונשל גויים, “He will dislodge,” the construction is parallel to that of ימל קצירו in Job 18,16 compared to Genesis 17,11 ונמלתם, you shall circumcise.” The root נשך also becomes ישך in the future tense.
Siftei Chakhamim
Will discard its fruit, meaning the same as “And the iron discards.” Rashi is not satisfied to say that that it (ישל) means being discarded, because it is a verb applying to an object where the object, i.e., the fruits, are missing [from the sentence]. Therefore he says, “Will discard its fruit, meaning the same as 'And the iron discards (נשל),'“ which is also a verb applying to an object and means that the iron will discard a piece from the wood being hewed, and it will go and kill him. (Re”m)