Etymology
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underdone (adj.)

1680s, in reference to cooked meat, from under + done. Old English underdon (v.), Middle English underdo meant "to put under, to subject, subjugate."

updated on February 26, 2014

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Definitions of underdone from WordNet

underdone (adj.)
insufficiently cooked;
Synonyms: half-baked
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.