Backstrap
Wiktionary, Creative Commons Attribution/Share-Alike License
noun.
A pull strap extending the
backstay
of a boot or shoe
noun.
The
backbone
of a book
noun.
A
loin
of meat consisting of the
muscle
on each side of the
spine
Word Usage
"The backstrap is not really very thick to begin with"
suggests
backstab
backstay
backstop
blackstrap