• Webster's Revised Unabridged Dictionary
    • v. i Underdo To do less than is requisite or proper; -- opposed to overdo.
    • v. t Underdo To do less thoroughly than is requisite; specifically, to cook insufficiently; as, to underdo the meat; -- opposed to overdo.
    • ***
Century Dictionary and Cyclopedia
    • underdo To put under; subject.
    • underdo To do less thoroughly than is requisite; especially, to cook insufficiently: as, the beef is underdone.
    • underdo To act below one's abilities; do less than one can.
    • underdo To do less than is requisite.
    • ***
Chambers's Twentieth Century Dictionary
    • v.t Underdo un-dėr-dōō′ to do less than is requisite, esp. to cook insufficiently
    • ***


In literature:

A young fellow should be ambitious to shine in everything; and, of the two, rather overdo than underdo.
"A Letter Book" by George Saintsbury
Clearly he was underdoing it.
"The Witch Doctor and other Rhodesian Studies" by Frank Worthington
Overdoing in one direction must be compensated by underdoing in another.
"A New Atmosphere" by Gail Hamilton
The English overdo or underdo everything, and are either drunk or in despair.
"Winterslow" by William Hazlitt