and hide one's head in the sand; have one's head in the sand
Fig. to ignore or hide from obvious signs of danger. (Alludes to an ostrich, which is believed incorrectly to hide its head in a hole in the ground when it sees danger.) Stop burying your head in the sand. Look at the statistics on smoking and cancer.
to refuse to think about an unpleasant situation, hoping that it will improve so that you will not have to deal with it Parents said bullying was being ignored, and accused the headmaster of burying his head in the sand.