Vine's Expository Dictionary of NT Words
"a knee" (Latin, genu), is used (a) metaphorically in Hebrews 12:12 , where the duty enjoined is that of "courageous self-recovery in God's strength;" (b) literally, of the attitude of a suppliant, Luke 5:8; Ephesians 3:14; of veneration, Romans 11:4; 14:11; Philippians 2:10; in mockery, Mark 15:19 . See KNEEL.
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Vines, W. E., M. A. Entry for 'Knee'. Vine's Expository Dictionary of NT Words. https://www.studylight.org/dictionaries/eng/ved/k/knee.html. 1940.