English

aknee

From a- + knee.

Formed from a- + knee

Proto-Indo-European *uds- ‘up, out’

Proto-Germanic *uz- ‘out-’

Proto-West Germanic *uʀ- ‘up, out, over’

English a-

Proto-Indo-European *ǵónu

…

Proto-Germanic *knewą

Proto-West Germanic *kneu

Old English cnēo

Middle English kne ‘the knee’

English knee

Today it means

adv On the knees.

Language periods are conventional ranges, not dates for this word.