膝カックンの英語

one knee

to kneel （down）―fall on one's knees―drop on one's knees―go down on one's knees

on bended knee

（膝を屈めるだけの意味なら）to bend one's knees―（礼拝、服従するの意味なら）―bow the knee （to or before god or man）―（屈服するの意味なら）―come to one's knees

hard on the knees

to squat in easy state―sit in a negligent posture

to sit knee to knee with one―sit opposite each other

to slap one's thigh

the leg from the knee to foot

the joint of a knee

a bone in a knee

bending the knees

to kneel

to commence falling on one's knees

to sit knee to knee with one―sit opposite each other

a rug for kneeling on called {'hizatsuki'}

to kneel down again

a dislocated knee

to cross one's legs （tailor-fashion）

to expose one's knees―show one's knees

the articular muscle of the knee

to have a familiar talk with one

to draw nearer

Your knees are out.

My knee hurts.

with shaking knees

Down on your knees!

an act of crossing one's legs at the knees

both knees

one's shins