以卵擊石

- throw an egg against a rock -- court defeat by fighting against overwhelming odds; (It's like) an egg dashing itself against a rock.; (like) an egg trying to crush [collide with] a stone; court one's own ruin; fight against heavy odds; fight a hopeless battle; grossly overestimate one's own strength; kick against the pricks; like an egg knocking itself against a stone -- grossly overestimate one's own strength; strike an egg on a rock; use eggs to fight against stone -- bound to be defeated; throw an egg at a rock [stone]; try to smash a stone with an egg