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Underflow is a condition which occurs in a computer or similar device when a mathematical operation results in a number which is smaller than what the device is capable of storing. It is the opposite of Overflow, which relates to a mathematical operation resulting in a number which is bigger than what the machine can store. Similar to overflow, underflow can cause significant errors.

Source: https://www.techopedia.com/definition/712/underflow

See:

• Overflow
• Wrap Around