This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 屟 is uncertain. It visually contains 尸 and 枼, but the origin and original meaning are unclear.
With no clear meaning, picture the 尸 enclosure as a shelter and 枼 as a table inside—perhaps a forgotten object in an old house.
For テイ, imagine a table (テーブル, teeburu) inside the shelter: the first syllable テー cues テイ.