From Longman Dictionary of Contemporary Englishhumble yourselfhumble yourselfMODESTto show that you are not too proud to ask for something, admit you are wrong etc I knew he had humbled himself to ask for my help. → humble
Examples from the Corpus
humble yourself• With Angel gone there was no need to humble herself and inquire if he had at last returned to work.• Not a lot of former 20-game winners would humble themselves that way.• Yet the school offered him nothing and lie had to humble himself to plead with me. 