granny knot

Noun

Meaning

a reef knot crossed the wrong way and therefore insecure

Source: WordNet

granny reef knot clove hitch

reef knot flat knot

A tightened granny knot can also jam and is often more difficult to untie than the reef knot. Source: Internet

The granny knot is the first step repeated twice, left over right, tuck under. Source: Internet

This is dangerous because the granny knot can slip when heavily loaded. Source: Internet