Definition of underflows:
(n) :
(computing) A condition in which the value of a computed quantity is smaller than the smallest non-zero value that can be physically stored; usually treated as an error condition.
(n) :
(computing) The error condition that results from an attempt to retrieve an item from an empty stack.
(v) :
(computing) To trigger the condition in which the value of a computed quantity is smaller than the smallest non-zero value that can be physically stored.
(v) :
(computing) To trigger the error condition resulting from attempting to retrieve a value from an empty stack.
(n) :
A current flowing below the surface.