verb (used with object), un·der·fed, un·der·feed·ing.
Examples from the Web for underfeed
The most complacent Britisher cannot hope to draw off the life-blood, and underfeed, and keep it up forever.The People of the Abyss|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|Jerome K. Jerome
It is a much more serious risk to overfeed the baby than to underfeed him.The Eugenic Marriage, Vol 2 (of 4)|W. Grant Hague