To refill is to fill something again, the way you refill your motorcycle's gas tank or refill your cat's water bowl when you notice it's almost empty.

You can also refill a prescription, by going to the pharmacy and getting another month's worth of medication. The bottle of pills itself can also be called a refill. People commonly use this word as a noun for the act of filling up, too: "Hey, grab that waiter and ask for a refill on the Cokes!"

Definitions of refill
  1. verb
    fill something that had previously been emptied
    refill my glass, please”
    synonyms: fill again, replenish
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    type of:
    fill, fill up, make full
    make full, also in a metaphorical sense
  2. noun
    a commercial product that refills a container with its appropriate contents
    “he got a refill for his ball-point pen”
    “he got a refill for his notebook”
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    type of:
    merchandise, product, ware
    commodities offered for sale
  3. noun
    a prescription drug that is provided again
    “he got a refill of his prescription”
    “the prescription specified only one refill
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    type of:
    ethical drug, prescription, prescription drug, prescription medicine
    a drug that is available only with written instructions from a doctor or dentist to a pharmacist
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