This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 鷉 is uncertain. It combines 虒 and 鳥, but the original semantic and phonetic roles are unclear.
The kanji has 鳥 (bird) on the right, so it likely relates to a kind of bird, but the specific meaning is obscure.
For テイ, imagine a bird taking a tea break: tea -> テイ, and the bird on the right sips tea.
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