A collision is when two or more things smash together. You shouldn't give yourself a pedicure while driving because it might result in a collision, wrecking your car and spoiling your toenail polish to boot.

Collision comes from the Latin col-, "together," and lædĕre, "to hurt by striking." When a train hits a car, that's a collision. An asteroid hurtling toward earth is on a "collision course" with our planet. Collision also works for abstract conflicts that get violent or hurt your brain somehow, like the collision between two politicians during a debate, or the collision of colors in your outfit.

Definitions of collision
  1. noun
    an accident resulting from violent impact of a moving object
    “three passengers were killed in the collision
    “the collision of the two ships resulted in a serious oil spill”
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    a collision between motor vehicles that produces minor damage
    multiple collisions of vehicles
    smash, smash-up
    a serious collision (especially of motor vehicles)
    type of:
    an unfortunate mishap; especially one causing damage or injury
  2. noun
    (physics) a brief event in which two or more bodies come together
    “the collision of the particles resulted in an exchange of energy and a change of direction”
    synonyms: hit
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    type of:
    contact, impinging, striking
    the physical coming together of two or more things
  3. noun
    a conflict of opposed ideas or attitudes or goals
    “a collision of interests”
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    type of:
    conflict, difference, difference of opinion, dispute
    a disagreement or argument about something important
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