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 patient is hooked up to a dialysis machine twice a week to filter out the cholesterol in the blood)
    Move slowly or in small quantities or numbers through something or in a specified direction. (people filtered out of the concert during the last set)
    (of information) gradually become known. (the news began to filter in from the hospital)

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