An archaic or obscure term of uncertain meaning, possibly related to a fixed expression or income derived from something grim.
Appears to combine 'grin' with 'come' or 'income,' but the exact historical meaning is uncertain. This may be a very specialized term from regional dialect, obsolete usage, or literary invention.
This is the kind of word that shows up once in a 400-year-old document and then never again, which makes etymologists tear their hair out—it might be a brilliant medieval pun or just a scribe's odd invention.
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