Beat your brains out Definition 1 of 3Pro Tip 1/3Metaphoric intensity This phrase exaggerates effort by likening intense thinking to a violent act. She was beating her brains out to remember the answer. Pro Tip 2/3Frustration implied Often used to express frustration during challenging mental tasks. I've been beating my brains out trying to learn calculus. Pro Tip 3/3Not literal It doesn't mean physical harm; it's a figure of speech for effort. They're beating their brains out to solve the puzzle.