chipmunk n.

early 15c., "to break off in small pieces" (intransitive, of stone); from Old English forcippian "to pare away by cutting, cut off," verbal form of cipp "small piece of wood" (see chip (n.1)).

Transitive meaning "to cut up, cut or trim into small pieces, diminish by cutting away a little at a time" is from late 15c. Sense of "break off fragments" is 18c. Related: Chipped; chipping. To chip in "contribute" (1861) is American English, perhaps from card-playing; but compare chop in "interrupt by remarking" (1540s). Chipped beef attested from 1826.

early 15c., "skin or fur of the (European) mink," from a Scandinavian source (compare Swedish menk "a stinking animal in Finland"). Applied in English to the animal itself from 1620s, and extended to the related (but larger) animal of North America by Capt. John Smith (1624). Related: Minkery "an establishment where minks are bred and trained for ratting" (by 1862, American English).