English is an evolving language. You probably have no problem using such words as camouflage, nose dive, radar, roadblock, spearhead etc. They are proper or good english words, right? They are now, but they came into the english language after being incorporated from military slang.
This is an English text in 1384:
Oure fadir þat art in heuenes halwid be þi name;
þi reume or kyngdom come to be. Be þi wille don in herþe as it is doun in heuene.
yeue to us today oure eche dayes bred.
And foryeue to us oure dettis þat is oure synnys as we foryeuen to oure dettouris þat is to men þat han synned in us.
And lede us not into temptacion but delyuere us from euyl.
Here is the same text in English in 1611:
Our father which art in heauen, hallowed be thy name.
Thy kingdom come. Thy will be done in earth as it is in heauen.
Giue us this day our daily bread.
And forgiue us our debts as we forgiue our debters.
And lead us not into temptation, but deliuer us from euill. Amen.
Here is the same text in English in 2011:
Our Father who art in heaven,
hallowed be your name.
Your kingdom come.
Your will be done
on earth as it is in heaven.
Give us this day our daily bread,
and forgive us our trespasses,
as we forgive those who trespass against us,
and lead us not into temptation,
but deliver us from evil.
Amen.
Who knows, this might be the proper english version in 2100:
Yo, Bid Daddy Upstairs,
You be chillin'
So be yo hood
You be sayin' it; I be doin' it
In dis hood and in Yo's
Gimme some eats
And cut me some slack
So's I be doin' it to dem dat diss me
Don't be pushin' me into no jive
And keep dem Crips away
Cuz you always be da Man
Skraight up.
http://www.anglik.net/englishlanguagehistory.htm