expression, godan verb (-ku)
kneel on one knee; genuflect
Describes the action of going down on one knee, often as a gesture of respect, proposal, or supplication.
彼は彼女の前で片膝をついてプロポーズした。
He knelt on one knee in front of her and proposed.
騎士は王の前で片膝をついた
The knight genuflected before the king.