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膝膕 [しっかく]

(See 膝窩・しっか) popliteal fossa/popliteal space/area behind the knee (obscure term) (noun (common) (futsuumeishi))

片膝 [かたひざ]
片膝を突く;片膝をつく [かたひざをつく]

(See 突く・つく・3) to kneel down on one knee/to genuflect (Expressions (phrases, clauses, etc.), Godan verb with `ku' ending)

片膝を立てる [かたひざをたてる]

to sit on the floor with one knee raised/to raise one knee/to sit with one knee up (Expressions (phrases, clauses, etc.), Ichidan verb)

立て膝;立膝 [たてひざ]

sitting with one knee drawn up (noun (common) (futsuumeishi), noun or participle which takes the aux. verb suru)