Rabbit-hole definitions

Something that is intricate or convoluted like a labyrinth and often has no outlet or resolution.
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Used other than as an idiom: see rabbit,"Ž hole. (The entrance to) a rabbit warren or burrow.
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(From Alice in Wonderland) A way into a bizarre world.

These mushrooms will take you down the rabbit hole, man.

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Origin of rabbit-hole

From the rabbit hole in Alice and Wonderland by Lewis Carroll, after entering which Alice encounters bizarre characters and situations impeding her escape