granny knot
Noun
Meaning
a reef knot crossed the wrong way and therefore insecure
Source: WordNetSynonyms
Hypernyms
Examples
A tightened granny knot can also jam and is often more difficult to untie than the reef knot.
The granny knot is the first step repeated twice, left over right, tuck under.
This is dangerous because the granny knot can slip when heavily loaded.