Something or someone that disgorges; a person or device that ejects or expels something.
From disgorge + -er (suffix forming agent nouns, from Old English -ere). One that disgorges.
Fishing hooks have a 'disgorger' tool—a small stick that pops the hook out of the fish's mouth without forcing your fingers in, proving that even the most specific tool names follow our basic English word-building rules.
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