γόνυ

Mark 15:19 γόνατα knees

They kept striking His head with a staff and spitting on Him. And they knelt down and bowed before Him.

Here: 'Knees'. Getting down on the knees is the first move of the full bow before a ruler.

Luke 5:8 γόνασιν knees

When Simon Peter saw this, he fell at Jesus’ knees. “Go away from me, Lord,” he said, “for I am a sinful man.”

Here: Jesus is presumably sitting in the boat, as he did to teach (v.3). Peter goes down at his knees, in the tight space of a boat full of fish. Grasping or falling at someone's knees was a familiar ancient gesture of a suppliant, someone begging a greater person for mercy.

Luke 22:41 γόνατα knees

And He withdrew about a stone’s throw beyond them, where He knelt down and prayed,

Here: 'Knees.' Together with θεὶς it means 'kneeling down'. Kneeling was a posture for urgent, humble pleading, not the everyday posture for prayer.

Acts 7:60 γόνατα on [his] knees

Falling on his knees, he cried out in a loud voice, “Lord, do not hold this sin against them.” And when he had said this, he fell asleep.

Here: Plural, “knees”. Stephen kneels, the posture of urgent, humble pleading. Jesus took the same posture in Gethsemane (Luke 22:41).

Acts 9:40 γόνατα knees

Then Peter sent them all out of the room. He knelt down and prayed, and turning toward her body, he said, “Tabitha, get up!” She opened her eyes, and seeing Peter, she sat up.

Here: Kneeling. Jews ordinarily prayed standing, so kneeling marks earnest, urgent prayer.

Acts 20:36 γόνατα knee

When Paul had said this, he knelt down with all of them and prayed.

Here: Plural, "knees": he went down on both knees. This was a posture of urgent, humble petition, not the ordinary standing posture of Jewish prayer.

Acts 21:5 γόνατα knees

But when our time there had ended, we set out on our journey. All the disciples, with their wives and children, accompanied us out of the city and knelt down on the beach to pray with us.

Here: 'Knees'. Kneeling marks this prayer as unusually solemn and earnest, since Jews normally stood to pray.

Romans 11:4 γόνυ [the] knee

And what was the divine reply to him? “I have reserved for Myself seven thousand men who have not bowed the knee to Baal.”

Here: Singular, as in the set phrase "bend the knee". Taken with the verb, it means kneeling in worship.

Romans 14:11 γόνυ, knee,

It is written: “As surely as I live, says the Lord, every knee will bow before Me; every tongue will confess to God.”

Here: 'Knee.' The body part stands for the whole person kneeling in homage.

Ephesians 3:14 γόνατά knees

... for this reason I bow my knees before the Father,

Here: "Knees". To "bend the knees" is the fixed biblical phrase for kneeling, either in prayer or in homage before a king or god.

Philippians 2:10 γόνυ knee

that at the name of Jesus every knee should bow, in heaven and on earth and under the earth,

Here: The knee stands for the whole person kneeling. Kneeling was the body language of a subject before a king, or of a worshipper before a god.

Hebrews 12:12 γόνατα knees

Therefore strengthen your limp hands and weak knees.

Here: Knees carry a person's weight and keep them standing and moving. Knees that 'turn to water' or 'give way' were a standard biblical picture of fear and exhaustion.