Tip out
From AmtWiki
A breakdown that happens when the foam near the tip of a sword (near where it usually hits things, about 3-4" from the end) becomes broken down to the point that when squeezed, the core can be felt. Such a sword is dangerous and should be repaired.
This happens frequently enough that fixing them is a standard operation, many Amtgarders can quickly perform this repair on the sidelines in a few minutes, replacing the tip with fresh foam.
Repeatedly replacing the tip (and only the tip) can produce a Frankensword.