Verb
(linguistics) To inflect into a form that cannot be used in independent declarative clauses.
In normal English speech one usually deranks "he should go" to "to go", as in "I told him where to go."
(military) To strip of rank; demote.
(more generally) To demote; to give a lower position within a hierarchy.
(video games) To lower or remove achievements and skill level.
To lower or remove an official ranking or accreditation.
To lower the status or importance of
Source: en.wiktionary.org