From Longman Dictionary of Contemporary Englishbury your head in the sandbury your head in the sandTTCto ignore an unpleasant situation and hope it will stop if you do not think about it → bury
Examples from the Corpus
bury your head in the sand• If you bury your head in the sand now, you may lose your house.• You'll never solve your problems if you just bury your head in the sand -- you have to face them. 