Shrink·ing, a. & n. from Shrink.
 Shrinking head Founding, a body of molten metal connected with a mold for the purpose of supplying metal to compensate for the shrinkage of the casting; -- called also sinking head, and riser.

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 Sink·ing, a. & n. from Sink.
 Sinking fund. See under Fund.
 Sinking head Founding, a riser from which the mold is fed as the casting shrinks. See Riser, n., 4.
 Sinking pump, a pump which can be lowered in a well or a mine shaft as the level of the water sinks.

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