omen
讖 centers on a spoken or written sign that foretells the future: an omen, prophecy, or portent conveyed through words.
讖 combines 言 (speech, words) with 韱, which likely contributes the sound and may relate to subtle or hidden things, together suggesting a hidden message or prophecy.
Words 言 beside the complex 韱 suggest a cryptic message: imagine a mysterious scroll covered in dense symbols that only a prophet can read, revealing an omen.
For シン, picture a shin (shin) bone-shaped omen appearing in the tea leaves: shin -> シン, and the words 言 on the left spell out the prophecy.
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foretelling; prophecy