verb (used with object)
to fill too full, so as to cause overflowing.
verb (used without object)
to become too full.

1200–50; Middle English overfillen, Old English oferfyllan. See over-, fill

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Do not overfill so the ice cubes don't freeze together.
Overfill and liquid gasoline may get sucked back, too.
Overfill problems can be significantly reduced by adding overfill protection.
The fill port shall have an integral overfill containment basin with a
  flow-back drain.
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