Resembling, containing, or having the quality of broth; thin and liquid like soup.
From broth (Old English broþ) plus -y suffix to form an adjective. The suffix -y transforms nouns into descriptive words meaning 'having the quality of.'
English speakers naturally add -y to nouns to make adjectives (like 'buttery,' 'meaty,' 'salty'), and 'brothy' is a perfect example of how flexible and creative our word-building system is.
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