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fender-bender, impaction, impingement, smash-up

air bag, bilge, blow, bump, closing, collision course, cosmic ray, fender-bender, head-on, impaction, impingement, k-meson, kaon, kappa-meson, kill, k particle, near miss, pi-meson, pion, prester, slam-bang, smash, smash-up, wind

contact, hit, hitting, impinging, striking