This is the 7370th most frequent Japanese word.
付けよ
"付けよ" is the imperative form of the verb "付ける," which means "to attach," "to apply," or "to add."
付けよ is used as an imperative verb form meaning 'add' in context of attaching notes.
その文章に注釈を付けよ。
Add notes to the text.
付けよ here implies 'attach' the new sign onto a surface.
新しい標識を付けよ。
Install the new sign.
付けよ is utilized to mean 'attach a part' in functional assembly.