quince tree
枸 centers on the quince tree, a specific fruit-bearing tree. The meaning is narrow and botanical, without broader abstract extensions.
枸 combines 木 (tree) with 句, which likely contributes the sound. The character is used specifically for the quince tree.
The tree radical 木 beside 句 suggests a specific tree. Picture a quince tree with its distinctive fruit hanging from the branches.
For ク, imagine a quince tree growing in a cool, shaded corner of the garden: cool -> ク, and the tree thrives there.
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