to tidy up / to put in order
ree-or-dee-NAH-reh
Synonymous with 'mettere in ordine' or 'sistemare'. All mean to put things in their proper place.
Riordina la tua camera prima di uscire.
Tidy up your room before going out.
Passiamo il pomeriggio a riordinare il garage.
We spend the afternoon tidying up the garage.