This is the 4179th most frequent Japanese word.
上段
"上段" means "upper level" or "high section."
In this sentence, '上段' ('joudan') refers to the 'upper stance' in kendo practice, which is a specific posture or technique.
剣道の練習で、彼は上段構えを使った。
During kendo practice, he used the upper stance.
Here, '上段' ('joudan') describes the upper tier or shelf in the context of furniture organization.
この本棚の上段には辞書が置いてあります。
Dictionaries are placed on the upper tier of this bookshelf.
In this sentence, '上段' ('joudan') is used to mean the upper level potentially in a spatial or architectural context.