BEAT (ONE'S) BRAINS OUT

try very hard to understand or think out something difficult; tire (oneself) out by thinking. —SHSBC Binder 6 Approved Glossary, —SHSBC Binder 11 Approved Glossary, —SHSBC Binder 17 Approved Glossary, —SHSBC Binder 18 Approved Glossary