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

n 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”
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

n (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”
Type of:
contact, impinging, striking
the physical coming together of two or more things

n a conflict of opposed ideas or attitudes or goals

“a collision of interests”
Type of:
conflict, difference, difference of opinion, dispute
a disagreement or argument about something important

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