fall on (one's) knees
To kneel down, usually in a show of respect, fealty, awe, subjection, or reverence. The members of the congregation all fell on their knees to begin their morning prayer. I fell on my knees at the sight of the devastation. That world leader still expects everyone to fall on their knees before him, in spite of all the polarizing actions he's taken.
Farlex Dictionary of Idioms. © 2024 Farlex, Inc, all rights reserved.