From Longman Dictionary of Contemporary Englishlittle did somebody know/realize/think etclittle did somebody know/realize/think etcNOTused to say that someone did not know or think that something would happen or was true Little did I know that the course of my life was about to change. → little
Examples from the Corpus
little did somebody know/realize/think etc• But little did he know at the time, how soon he'd need it. 