throw oneself at someone's feet
1. Lit. to bow down humbly at someone's feet; to prostrate oneself before someone. In his guilt and horror, he threw himself at the feet of his master and begged forgiveness.
2. Fig. to beg someone's mercy, forgiveness, blessing, etc. I throw myself at your feet and beg for your blessing. I love you sincerely, Jane. I throw myself at your feet and await your command. I'm your slave!