Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • transitive verb To do to an insufficient degree, especially to cook for too short a time.

from The Century Dictionary.

  • To put under; subject.
  • To do less thoroughly than is requisite; especially, to cook insufficiently: as, the beef is underdone.
  • To act below one's abilities; do less than one can.
  • To do less than is requisite.

from the GNU version of the Collaborative International Dictionary of English.

  • intransitive verb To do less than is requisite or proper; -- opposed to overdo.
  • transitive verb To do less thoroughly than is requisite; specifically, to cook insufficiently; ; -- opposed to overdo.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • verb transitive, obsolete To put under, subject.
  • verb transitive To do something insufficiently; especially to undercook.
  • verb intransitive To act below one's abilities; do less than one can.
  • verb intransitive To do less than is requisite.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Middle English underdon, from Old English underdōn ("to put under"), from Proto-Germanic *under + *dōnan (“to put”), equivalent to under- +‎ do. Cognate with German unterthun ("to put under, subject").

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