Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

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

from the GNU version of the Collaborative International Dictionary of English

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

from The Century Dictionary and Cyclopedia

  • 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.

Etymologies

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"). (Wiktionary)

Examples

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