gyoza
餃 centers on a specific food: gyoza, the pan-fried dumpling. The meaning is narrow and concrete, with no abstract extensions.
餃 combines 飠 (food) with 交, which likely contributes the sound. The character was created specifically for the Chinese word for dumpling, and the modern form preserves that phono-semantic structure.
The food radical 飠 on the left tells you this is something to eat. The right side 交 looks like a crossed or folded shape, like a gyoza wrapper pinched together. Picture a steaming gyoza being folded: 餃.
For ギョウ, imagine a giant gyoza so big it makes a loud 'gyow!' sound when you bite it: gyow -> ギョウ. The sound matches the dumpling's shape and the kanji's meaning.
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gyoza; pot sticker; crescent-shaped pan-fried dumplings stuffed with minced pork and vegetables
chicken wings filled with gyoza stuffing
deep-fried gyoza
boiled gyoza
pan-fried gyoza
hanetsuki gyoza; gyoza with wings
steamed gyoza
gyōza wrapper
dumpling shop; gyoza restaurant