From Longman Dictionary of Contemporary Englishin your hour of needin your hour of needPROBLEMwhen you are in trouble and need someone to help you How could she abandon her father now, in his hour of need? → need
Examples from the Corpus
in your hour of need• Is there anyone, anyone at all, to whom he might go in his hour of need?• Right-wing columnists are refusing to rally to Mr Major in his hour of need.• Besides, how could he abandon his father now, in his hour of need?• He helped others in their hour of need. 