Idiom: "stuffed to the gills"

[Ketty]

what does the idiom "stuffed to the gills" mean?

Ketty

[Mister Micawber]

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Stuffed to the gills describes someone who has eaten as much as possible.

(Gills are oxygen-absorbing organs on a fish, and are located near the top of the esophagus. If humans had gills, they would be on the sides of our throats or behind our ears.)
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Native English teacher at Mister Micawber's