Full of gaps or spaces; having multiple openings or missing parts.
From 'gap' plus the suffix '-y' (which turns nouns into adjectives meaning 'full of' or 'characterized by'). Common pattern in English: happy, sleepy, rainy, etc.
The '-y' suffix is magical—it transforms almost any noun into an adjective describing abundance of that thing, which is why English has so many words like 'buggy,' 'leafy,' and 'gappy' without needing them in the dictionary.
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