Holdback

[Becky]

The projection or loop on the thill of a vehicle. to
which a strap of the harness is attached, to hold back a carriage when
going down hill, or in backing; also, the strap or part of the harness
so used.

[Kai]

The tiny portions of a [BLOB] which have been intentionally and systematically removed from its original dataset prior to [compression] and [encryption], for purposes of ensuring said [BLOB] can be freely distributed in this [deconstituted] form, yet cannot possibly be reconstituted without first reinserting said extracted portions to their original locations within the dataset.

[Vania]

part of an amount of money that is not paid in a particular situation:

[Justin Bieber]

A thing serving to hold something else in place.

[Tracie Lynn]

Hesitate to act or speak.