loquat
杇 refers to the loquat, a fruit-bearing tree. The meaning is specific and botanical, with no clear abstract extensions.
杇 combines 木 (tree) with 亏, which likely contributes a phonetic element. The exact historical development is uncertain, and the character is rare.
The tree radical 木 beside 亏 suggests a specific tree. Picture a loquat tree with its distinctive leaves and fruit.
For オ, imagine an old loquat tree: old -> オ, and the tree is the loquat.