• Webster's Revised Unabridged Dictionary
    • v. t Underfeed To feed with too little food; to supply with an insufficient quantity of food.
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Century Dictionary and Cyclopedia
    • underfeed Noting apparatus which feeds or supplies fresh material from below; specifically, noting a form of mechanical feeder for fuel of boiler-furnaces, designed for bituminous coal rich in volatile components. The coal is fed through a tubular channel and enters the burning area from under the bed of ignited fuel. The gases first distilled off must pass up through the glowing bed above them and become heated enough to unite with oxygen and burn with little smoke. After the coking is completed the solid carbon begins to glow and burn, and its combustion is completed as it reaches the top of the fuel-bed and rolls outward toward the sides of the grate area proper. This feeder is particularly well adapted for pitchy or fat coals. Jour. Franklin Iust, Dec, 1904, p. 439.
    • underfeed To supply with too little food; feed insufficiently.
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Chambers's Twentieth Century Dictionary
    • v.t Underfeed un-dėr-fēd′ to feed inadequately
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In literature:

The most complacent Britisher cannot hope to draw off the life-blood, and underfeed, and keep it up forever.
"The People of the Abyss" by Jack London
Underfeed your rank and file, and what sort of a fight are you going to put up against your rivals.
"All Roads Lead to Calvary" by Jerome K. Jerome
A great many breeders underfeed their young stock to stop growth, which I believe to be a very grave mistake.
"The Boston Terrier and All About It" by Edward Axtell
Mechanical Stokers are of three general types: 1st, overfeed; 2nd, underfeed; and 3rd, traveling grate.
"Steam, Its Generation and Use" by Babcock & Wilcox Co.
It is a much more serious risk to overfeed the baby than to underfeed him.
"The Eugenic Marriage, Vol 2 (of 4)" by W. Grant Hague
She will overwork you, I'm afraid: I only hope she won't underfeed you.
"Lippincott's Magazine, Vol. 22, November, 1878" by Various