[uhn-der-feed for 1; uhn-der-feed for 2]
verb (used with object), underfed, underfeeding.
to feed insufficiently.
to feed with fuel from beneath.

1650–60; under- + feed

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World English Dictionary
vb , -feeds, -feeding, -fed
1.  to give too little food to
2.  to supply (a furnace, engine, etc) with fuel from beneath
3.  an apparatus by which fuel, etc, is supplied from below

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Example sentences
There are two general types of systems- underfeed and overfeed.
The wood fuel is introduced either on top of the pile or through an underfeed
  arrangement using an auger.
At length the animals began to drop and die in harness, from overwork and
  underfeed, which forced us to stop.
Multiple retort underfeed stokers are used for coking coals with high ash
  fusion temperatures.
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