If you make something like new, you renew it. When you catch up with an old friend you haven't seen in a long time, you renew your friendship.

To renew is to make new again. If you get a new due date for your library books, you've renewed them. If you forget to renew them, your books will be overdue, and you may have to pay a fine. Renew also means to revive, restore, or cause to appear in a new form. Historically, all kinds of tonics have claimed to renew a person's health, but many of the early ones actually contained poisons that could kill you.

Definitions of renew
  1. verb
    reestablish on a new, usually improved, basis or make new or like new
    “We renewed our friendship after a hiatus of twenty years”
    “They renewed their membership”
    synonyms: regenerate
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    substitute a person or thing for (another that is broken or inefficient or lost or no longer working or yielding what is expected)
    freshen up, refurbish, renovate
    make brighter and prettier
    to patch up or renovate; repair or restore
    remold, remould, retread
    give new treads to (a tire)
    renovate, restitute
    restore to a previous or better condition
    freshen, refresh
    make (to feel) fresh
    revitalise, revitalize
    give new life or vigor to
    regenerate, rejuvenate, restore
    return to life; get or give new life or energy
    modernise, modernize, overhaul
    make repairs, renovations, revisions or adjustments to
    reconstruct, restore
    return to its original or usable and functioning condition
    change, commute, convert, exchange
    exchange or replace with another, usually of the same kind or category
    remove or replace the coverings of
    renovate so as to make it conform to middle-class aspirations
    cause to appear in a new form
    resurrect, revive
    restore from a depressed, inactive, or unused state
    substitute new or modernized parts or equipment for older ones
    air, air out, vent, ventilate
    expose to cool or cold air so as to cool or freshen
    replace with something new, especially an old obligation by a new one
    decompress, uncompress
    restore to its uncompressed form
    help to readapt, as to a former state of health or good repute
    restore to a state of good condition or operation
    stop the fibrillation and restore normal contractions, usually by means of electric shocks
    restore to the previous state or rank
    type of:
    create anew
  2. verb
    cause to appear in a new form
    synonyms: reincarnate
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    type of:
    regenerate, rejuvenate, restore
    return to life; get or give new life or energy
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