An uncommon or archaic term, possibly referring to a grotesque face or expression, or a variant of gargoyle-like figure.
From French 'gra-bouche' or similar—possibly combining 'gra' with 'bouche' (mouth); obscure etymology suggests folk or theatrical origin.
This word is so rare that most dictionaries don't include it—it might be a theatrical term that got lost, or a regional French word that never quite made it into English.
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