plodder

The English word “plodder” has 3 meanings listed here.

noun

A person who, or animal that, plods.
A person who works slowly, making a great effort with little result; a person who studies laboriously.
A machine for extruding soap, margarine, etc. through a die plate so it can be cut into billets.

From Middle English plodder, equivalent to plod + -er.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.