We found one dictionary that defines the word underhouse:

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1. underhouse: Wiktionary

Definitions from Wiktionary (underhouse) ▸ adjective:  Located beneath a house. ▸ Words similar to underhouse ▸ Usage examples for underhouse ▸ Idioms related to underhouse ▸ Wikipedia articles (New!) ▸ Popular nouns described by underhouse ▸ Words that often appear near underhouse ▸ Rhymes of underhouse ▸ Invented words related to underhouse