all i know is that
http://www.merriam-webster.com/dictionary/jagger
says:
Main Entry:1jag

Pronunciation: \ˈjag\ Function:
verb Inflected Form(s):jagged; jag·gingEtymology:Middle English
jaggenDate:15th century
transitive verb1
chiefly dialect : prick ,
stab
2
: to cut indentations into ;
also : to form teeth on (a saw) by cutting indentations
intransitive verb1
: prick ,
thrust2
: to move in jerks
— jag·ger noun
and if you click on prick it says
Main Entry:1prick

Pronunciation: \ˈprik\ Function:
noun Etymology:Middle English
prikke, from Old English
prica; akin to Middle Dutch
pric prickDate:before 12th century 1
: a mark or shallow hole made by a pointed instrument
2 a
: a pointed instrument or weapon b
: a sharp projecting organ or part
3
: an instance of pricking or the sensation of being pricked: as a
: a nagging or sharp feeling of remorse, regret, or sorrow
b
: a slight sharply localized discomfort <the
prick of a needle>
4
usually vulgar : penis
5
usually vulgar : a spiteful or contemptible man often having some authority
so I am guessing you are going to argue with the webster dictionary. Because I mean that isn't an established and respected reference now is it? I bet your an awesome student.