filter

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filter
  • noun
    A porous device for removing impurities or solid particles from a liquid or gas passed through it. (an oil filter)
    An arrangement whereby vehicles may turn left (or right) while other traffic waiting to go straight ahead or turn right (or left) is stopped by a red light. (a filter lane)
    verb
    Pass (a liquid, gas, light, or sound) through a device to remove unwanted material. (the eye filters out ultraviolet radiation)
    Move slowly in a specified direction. (the players filtered out on to the pitch)

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