rabbit hole
US /ˈræb.ɪt ˌhoʊl/
UK /ˈræb.ɪt ˌhoʊl/
1.
a burrow dug by rabbits as a dwelling
:
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The dog sniffed around the rabbit hole, hoping to find its occupant.
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We saw a tiny rabbit hole at the base of the old oak tree.
2.
a metaphor for a bizarre, confusing, or difficult situation or process that is hard to escape from, often leading to further complications or unexpected discoveries
:
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I fell down a rabbit hole of conspiracy theories online.
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Researching my family history led me down a fascinating rabbit hole.