That's most definitely a typo!

I know. Still, I think it should be corrected, because some people don't know English and will believe anything that's in leo.

Moser, I was agreeing with you :-)

"Whenever people agree with me I always feel I must be wrong." (Oscar W.)

Es ist wohl immer noch so im Wöbu : Dictionary: kneen

related discussion: kniend

FWIW, I quite like kneen. The phrase actually occurs as such in old or historicizing books and should merely be marked as obsolete/antiquated.

The phrase actually occurs as such in old or historicizing books and should merely be marked as obsolete/antiquated.
What is your evidence for this, a Google search? I searched "on his kneen" and did indeed get hits in older books. I thought it possible that there was some old typographic feature like a ligature that was causing the result, however, so I clicked on four of them and looked. In each case the text highlighted in yellow clearly was "on his knees."

kneen ‎(plural)
Obsolete or dialectal plural form of knee.
https://en.wiktionary.org/wiki/kneen#English

... the -s plural took over other plural inflections. Most nouns were reanalyzed to take the -s (like shoe/shoon to shoe/shoes and knee/kneen to knee/knees) until plurals were almost perfectly uniform.
http://www.earthwidemoth.com/wiki/Early_Moder...

The following -(e)n plurals are found in dialectal, rare, or archaic usage:
...
hose hosen (rare/archaic, used in King James Version of the Bible)
knee kneen (archaic/obsolete)
https://en.wikipedia.org/wiki/English_plurals

In the 16th century, there are certain words that survive with the weak plural —en, but after that they are replaced by the —s forms for example , fon , kneen, eyen, and shoon are placed by foes , knees, eyes, and shoes. Today ,the only plural of this type is oxen.
https://www.facebook.com/permalink.php?id=599...

Did some joker make this all up ...?
I don't think so.

#8: Did some joker make this all up ...?

It can be hard to tell with openly editable sources.

In the meantime "one one's kneen" has been removed from LEO, which I agree with.

English used to have a variety of forming plurals, but I don't think LEO needs to have entries for all of them. Even if someone were to make a case for including kneen as an archaic plural, there's no need for a phrase like "on one's kneen," which suggests to the unsuspecting person who looks up kniend that it is still productive.

If anyone wants to have a discussion of archaic plurals in English, perhaps you could start a discussion in Language Lab. It seems to me that there's no need to bombard Doris further by continuing this thread.