alone
杕 centers on the idea of being alone or solitary, often applied to a single tree standing apart.
杕 combines 木 (tree) with 大 (big), likely depicting a large, solitary tree standing alone. The exact historical development is uncertain.
A big tree 大 beside a regular tree 木: one tree stands out, alone and solitary.
For テイ, picture a solitary tree on a tea plantation: tea -> テイ, and the lone tree stands apart from the others.
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