When a small company challenges an industry giant, it inevitably feels like a dragonfly trying to shake a stone pillar.
Tips
memory
Picture a tiny dragonfly (蜻蜓) landing on a stone column (石柱) and beating its wings to topple it. The image of the imbalance is the whole point - visualize it once and the meaning sticks.
usage
Carries two flavors: (1) hopelessly overmatched effort, and (2) the target is so unmoved it does not even register the attempt. Often used self-deprecatingly or to mock an opponent's bluster.
