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

v 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”
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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

v cause to appear in a new form

Type of:
regenerate, rejuvenate, restore
return to life; get or give new life or energy

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