What prefix word means to make something less or smaller?

The prefix word that means to make something less or smaller is "sub-".

Here are some examples:

* Subdue: to make someone or something less powerful or strong.

* Submerge: to put something under water or another liquid.

* Substandard: below the usual or acceptable standard.

* Subcontract: to give part of a job to another company.

* Subatomic: smaller than an atom.